2022
Wojtecki, Ł.; Konicek, P.; Mendecki, M. J.; Zuberek, W. M.
Evaluation of Destress Blasting Effectiveness Using the Seismic Moment Tensor Inversion and Seismic Effect Methods Journal Article
In: International Journal of Geomechanics, vol. 22, no. 4, 2022, ISSN: 15323641, (7).
@article{2-s2.0-85124290568,
title = {Evaluation of Destress Blasting Effectiveness Using the Seismic Moment Tensor Inversion and Seismic Effect Methods},
author = { Ł. Wojtecki and P. Konicek and M.J. Mendecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124290568&doi=10.1061%2f%28ASCE%29GM.1943-5622.0002314&partnerID=40&md5=2ae6bce6d942e144ed22f639240d5942},
doi = {10.1061/(ASCE)GM.1943-5622.0002314},
issn = {15323641},
year = {2022},
date = {2022-01-01},
journal = {International Journal of Geomechanics},
volume = {22},
number = {4},
publisher = {American Society of Civil Engineers (ASCE)},
abstract = {The effectiveness evaluation of long-hole destress blasting in an underground hard coal mine was made via the seismic effect method and the seismic moment tensor inversion. The seismic effect method is based on the difference between seismic and explosive energies, indicating that additional processes appeared to change the stress state in the rock mass, however, the seismic effect does not consider the focal mechanism. Therefore, the seismic moment tensor inversion was applied. Tremors that were an effect of long-hole destress blasting during the extraction of coal seam No. 507 in one of the hard coal mines localized in the Polish part of the Upper Silesian Coal Basin were analyzed. The results of the preceding applied methods were compared. High values of seismic effect indicate stress relaxation and thus the occurrence of additional processes, leading to a new stress equilibrium state in the rock mass. It has been shown that in analyzed cases, achieving such a state corresponded to the presence of a nonexplosive mechanism, with a large share or domination of the double couple component in the full seismic moment tensor solution. The reverse slip mechanism was present in the foci of provoked tremors, which can be associated with the displacement of rock blocks under conditions of high horizontal stress. Convergent results of the methods used confirm that the appropriate design of blasting parameters in relation to specific geological and mining conditions make it possible to provoke additional geomechanical processes in the rock mass. © 2022 American Society of Civil Engineers.},
note = {7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effectiveness evaluation of long-hole destress blasting in an underground hard coal mine was made via the seismic effect method and the seismic moment tensor inversion. The seismic effect method is based on the difference between seismic and explosive energies, indicating that additional processes appeared to change the stress state in the rock mass, however, the seismic effect does not consider the focal mechanism. Therefore, the seismic moment tensor inversion was applied. Tremors that were an effect of long-hole destress blasting during the extraction of coal seam No. 507 in one of the hard coal mines localized in the Polish part of the Upper Silesian Coal Basin were analyzed. The results of the preceding applied methods were compared. High values of seismic effect indicate stress relaxation and thus the occurrence of additional processes, leading to a new stress equilibrium state in the rock mass. It has been shown that in analyzed cases, achieving such a state corresponded to the presence of a nonexplosive mechanism, with a large share or domination of the double couple component in the full seismic moment tensor solution. The reverse slip mechanism was present in the foci of provoked tremors, which can be associated with the displacement of rock blocks under conditions of high horizontal stress. Convergent results of the methods used confirm that the appropriate design of blasting parameters in relation to specific geological and mining conditions make it possible to provoke additional geomechanical processes in the rock mass. © 2022 American Society of Civil Engineers.
2021
Mendecki, M. J.; Pakosz, R.; Wojtecki, Ł.; Zuberek, W. M.
Spatiotemporal analysis of elastic and inelastic deformations in roof-rocks from seismological observations Journal Article
In: International Journal of Mining Science and Technology, vol. 31, no. 2, pp. 241-251, 2021, ISSN: 20952686, (2).
@article{2-s2.0-85098121438,
title = {Spatiotemporal analysis of elastic and inelastic deformations in roof-rocks from seismological observations},
author = { M.J. Mendecki and R. Pakosz and Ł. Wojtecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098121438&doi=10.1016%2fj.ijmst.2020.12.001&partnerID=40&md5=6f84bbdcca0ef5031d59aced0387b75d},
doi = {10.1016/j.ijmst.2020.12.001},
issn = {20952686},
year = {2021},
date = {2021-01-01},
journal = {International Journal of Mining Science and Technology},
volume = {31},
number = {2},
pages = {241-251},
publisher = {China University of Mining and Technology},
abstract = {The spatiotemporal analysis of seismic zones characterised by the scattering and accumulation of strain energy in the roof-rocks of the excavated longwall panel where inelastic or elastic deformations occurred during hard coal seam mining is discussed. The studied longwall panel was designed to utilize the effect of partial stress relaxation caused by the earlier extraction of the coal seams located above. A full seismic moment tensor and spectral source parameter analyses were used to obtain information about the degree of inelastic and elastic coseismic deformations. This study also showed that these deformation changes correspond to variation in the Benioff strain release characteristics. Next, analyses of deformation zones were compared with the relationship between radiated energy and the excavated volume of rocks per month. The concept of balanced seismic energy release assumed the exponential increase of released seismic energy with the increase in the volume of excavated rock. Discrepancies between the observed and predicted radiated energies indicated that strain energy in selected zones in the rock mass was either scattered if the prediction was overestimated, or accumulated if underestimated. Moreover, the study showed that elastic deformation in one zone can lead to inelastic deformation in the same zone. © 2021},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The spatiotemporal analysis of seismic zones characterised by the scattering and accumulation of strain energy in the roof-rocks of the excavated longwall panel where inelastic or elastic deformations occurred during hard coal seam mining is discussed. The studied longwall panel was designed to utilize the effect of partial stress relaxation caused by the earlier extraction of the coal seams located above. A full seismic moment tensor and spectral source parameter analyses were used to obtain information about the degree of inelastic and elastic coseismic deformations. This study also showed that these deformation changes correspond to variation in the Benioff strain release characteristics. Next, analyses of deformation zones were compared with the relationship between radiated energy and the excavated volume of rocks per month. The concept of balanced seismic energy release assumed the exponential increase of released seismic energy with the increase in the volume of excavated rock. Discrepancies between the observed and predicted radiated energies indicated that strain energy in selected zones in the rock mass was either scattered if the prediction was overestimated, or accumulated if underestimated. Moreover, the study showed that elastic deformation in one zone can lead to inelastic deformation in the same zone. © 2021
2020
Wojtecki, Ł.; Mendecki, M. J.; Gołda, I.; Zuberek, W. M.
In: Pure and Applied Geophysics, vol. 177, no. 12, pp. 5723-5739, 2020, ISSN: 00334553, (1).
@article{2-s2.0-85093931400,
title = {The Seismic Source Parameters of Tremors Provoked by Long-Hole Destress Blasting Executed During the Longwall Mining of a Coal Seam Under Variable Stress Conditions},
author = { Ł. Wojtecki and M.J. Mendecki and I. Gołda and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85093931400&doi=10.1007%2fs00024-020-02603-z&partnerID=40&md5=b171ed560a0b1a089a9d332bdc2a96c3},
doi = {10.1007/s00024-020-02603-z},
issn = {00334553},
year = {2020},
date = {2020-01-01},
journal = {Pure and Applied Geophysics},
volume = {177},
number = {12},
pages = {5723-5739},
publisher = {Birkhauser},
abstract = {The underground mining of coal seams in the Upper Silesian Coal Basin is carried out at great depths and mostly in the presence of remnants or edges of other surrounding coal seams, i.e. under the condition of high stress level in the rock mass. Therefore, this mining is accompanied by rockburst hazard and suitable preventive action is required. Long-hole destress blasting plays an important role and is commonly applied in rockburst prevention in underground hard coal mines. Estimated blasting effectiveness is important when designing rockburst prevention. It is commonly estimated on the basis of the seismic energy of a provoked tremor. The seismic source parameters have already been considered for this purpose. Additional information about the effects of long-hole destress blasting could be contemplated in the planning of active rockburst prevention. The seismic source parameters of tremors provoked by long-hole destress blasting have been calculated and are presented in this article. Destress blasts were performed during the longwall mining of coal seam no. 506 in one of the hard coal mines in the Upper Silesian Coal Basin. They were executed from the longwall face, in order to destress the rock mass ahead of it. Parameters of the blasts were variable and they were modified according to geological and mining conditions and the observed level of rockburst hazard. The seismic source parameters have been determined for tremors provoked directly after firing explosives and for tremors occurring in the waiting time, and they have been compared with each other. © 2020, The Author(s).},
note = {1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The underground mining of coal seams in the Upper Silesian Coal Basin is carried out at great depths and mostly in the presence of remnants or edges of other surrounding coal seams, i.e. under the condition of high stress level in the rock mass. Therefore, this mining is accompanied by rockburst hazard and suitable preventive action is required. Long-hole destress blasting plays an important role and is commonly applied in rockburst prevention in underground hard coal mines. Estimated blasting effectiveness is important when designing rockburst prevention. It is commonly estimated on the basis of the seismic energy of a provoked tremor. The seismic source parameters have already been considered for this purpose. Additional information about the effects of long-hole destress blasting could be contemplated in the planning of active rockburst prevention. The seismic source parameters of tremors provoked by long-hole destress blasting have been calculated and are presented in this article. Destress blasts were performed during the longwall mining of coal seam no. 506 in one of the hard coal mines in the Upper Silesian Coal Basin. They were executed from the longwall face, in order to destress the rock mass ahead of it. Parameters of the blasts were variable and they were modified according to geological and mining conditions and the observed level of rockburst hazard. The seismic source parameters have been determined for tremors provoked directly after firing explosives and for tremors occurring in the waiting time, and they have been compared with each other. © 2020, The Author(s).
Wojtecki, Ł.; Konicek, P.; Mendecki, M. J.; Gołda, I.; Zuberek, W. M.
Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam Journal Article
In: Pure and Applied Geophysics, vol. 177, no. 2, pp. 905-917, 2020, ISSN: 00334553, (11).
@article{2-s2.0-85079250121,
title = {Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam},
author = { Ł. Wojtecki and P. Konicek and M.J. Mendecki and I. Gołda and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079250121&doi=10.1007%2fs00024-019-02321-1&partnerID=40&md5=89356192373c323287f035bc0606c806},
doi = {10.1007/s00024-019-02321-1},
issn = {00334553},
year = {2020},
date = {2020-01-01},
journal = {Pure and Applied Geophysics},
volume = {177},
number = {2},
pages = {905-917},
publisher = {Birkhauser},
abstract = {Deep longwall mining of coal seams is made in the Upper Silesian Coal Basin (USCB) under complicated and mostly unfavourable geological and mining conditions. Usually, it is correlated with rockburst hazard mostly at a high level. One of the geological factors affecting the state of rockburst hazard is the presence of competent rocks in the roof of extracted coal seams, so rock falling behind the longwall face does not occur, and hanging-up of roof rocks remains. The long-lasting absence of caving may lead to an occurrence of high-energy tremor in the vicinity of the longwall face. Roof caving behind the longwall face may be forced by blasting. The column of explosives is then located in blastholes drilled in layers of roof rocks, e.g. sandstones behind the longwall face. In this article, a characterization of tremors initiated by blasts for roof caving during underground extraction of coal seam no. 507 in one of the collieries in the USCB has been made using three independent methods. By the basic seismic effect method, the effectiveness of blasting is evaluated according to the seismic energy of incited tremors and mass of explosives used. According to this method, selected blasts gave extremely good or excellent effect. An inversion of the seismic moment tensor enables determining the processes happening in the source of tremors. In the foci of provoked tremors the slip mechanism dominated or was clearly distinguished. The expected explosion had lesser significance or was not present. By the seismic source parameters analysis, among other things, an estimation of the stress drop in the focus or its size may be determined. The stress drop in the foci of provoked tremors was in the order of 105 Pa and the source radius, according to the Brune’s model, varied from 44.3 to 64.5 m. The results of the three mentioned methods were compared with each other and observations in situ. In all cases the roof falling was forced. © 2019, The Author(s).},
note = {11},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Deep longwall mining of coal seams is made in the Upper Silesian Coal Basin (USCB) under complicated and mostly unfavourable geological and mining conditions. Usually, it is correlated with rockburst hazard mostly at a high level. One of the geological factors affecting the state of rockburst hazard is the presence of competent rocks in the roof of extracted coal seams, so rock falling behind the longwall face does not occur, and hanging-up of roof rocks remains. The long-lasting absence of caving may lead to an occurrence of high-energy tremor in the vicinity of the longwall face. Roof caving behind the longwall face may be forced by blasting. The column of explosives is then located in blastholes drilled in layers of roof rocks, e.g. sandstones behind the longwall face. In this article, a characterization of tremors initiated by blasts for roof caving during underground extraction of coal seam no. 507 in one of the collieries in the USCB has been made using three independent methods. By the basic seismic effect method, the effectiveness of blasting is evaluated according to the seismic energy of incited tremors and mass of explosives used. According to this method, selected blasts gave extremely good or excellent effect. An inversion of the seismic moment tensor enables determining the processes happening in the source of tremors. In the foci of provoked tremors the slip mechanism dominated or was clearly distinguished. The expected explosion had lesser significance or was not present. By the seismic source parameters analysis, among other things, an estimation of the stress drop in the focus or its size may be determined. The stress drop in the foci of provoked tremors was in the order of 105 Pa and the source radius, according to the Brune’s model, varied from 44.3 to 64.5 m. The results of the three mentioned methods were compared with each other and observations in situ. In all cases the roof falling was forced. © 2019, The Author(s).
2019
Mendecki, M. J.; Wojtecki, Ł.; Zuberek, W. M.
Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors Journal Article
In: Pure and Applied Geophysics, vol. 176, no. 8, pp. 3487-3508, 2019, ISSN: 00334553, (10).
@article{2-s2.0-85064163042,
title = {Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors},
author = { M.J. Mendecki and Ł. Wojtecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85064163042&doi=10.1007%2fs00024-019-02144-0&partnerID=40&md5=be2a8e96eeb85a224ae7cc2af9e3c049},
doi = {10.1007/s00024-019-02144-0},
issn = {00334553},
year = {2019},
date = {2019-01-01},
journal = {Pure and Applied Geophysics},
volume = {176},
number = {8},
pages = {3487-3508},
publisher = {Birkhauser Verlag AG},
abstract = {We would like to test the concept that induced seismicity prior to relatively large mining tremor (ML > 2.5; E > 106J) can be inferred from the cumulative Benioff strain release (BSR) as power law time-to-failure before the strong event. This study presents the application of accelerating BSR prior to a large earthquake, widely used in natural seismicity, for analysis of this phenomenon in induced seismicity. The Benioff strain release is quantified as accelerated releases of cumulative (square root sum) of seismic energy in the time series. During the study, five sequences were extracted from the seismic catalogues from two Polish hard coal mines: exhausted Bobrek Mine (data form the IS-EPOS Platform) and from a mine belonging to the Polish Mining Group. Next, a search radius was used to select precursory events and to indicate the type of processes occurring in the coal seam and its vicinity. The fitted power law of cumulative Benioff strain release showed changes of m-parameter. If the value of m was lower than 1.0, the process was regarded as an accelerating-like and if m was higher than 1.0—as a quiescence-like. The investigation of m-parameter vs. the search radius showed the general behaviour of the rock mass in the studied areas and allowed to evaluate the relationship between the critical radius and magnitude of the target event. The obtained scaling relation log(Rc) ~ 0.35 ML is similar to these reported by other authors who analysed natural seismicity which might suggest that the scaling relation works in a wide range of magnitudes. © 2019, The Author(s).},
note = {10},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We would like to test the concept that induced seismicity prior to relatively large mining tremor (ML > 2.5; E > 106J) can be inferred from the cumulative Benioff strain release (BSR) as power law time-to-failure before the strong event. This study presents the application of accelerating BSR prior to a large earthquake, widely used in natural seismicity, for analysis of this phenomenon in induced seismicity. The Benioff strain release is quantified as accelerated releases of cumulative (square root sum) of seismic energy in the time series. During the study, five sequences were extracted from the seismic catalogues from two Polish hard coal mines: exhausted Bobrek Mine (data form the IS-EPOS Platform) and from a mine belonging to the Polish Mining Group. Next, a search radius was used to select precursory events and to indicate the type of processes occurring in the coal seam and its vicinity. The fitted power law of cumulative Benioff strain release showed changes of m-parameter. If the value of m was lower than 1.0, the process was regarded as an accelerating-like and if m was higher than 1.0—as a quiescence-like. The investigation of m-parameter vs. the search radius showed the general behaviour of the rock mass in the studied areas and allowed to evaluate the relationship between the critical radius and magnitude of the target event. The obtained scaling relation log(Rc) ~ 0.35 ML is similar to these reported by other authors who analysed natural seismicity which might suggest that the scaling relation works in a wide range of magnitudes. © 2019, The Author(s).
2017
Mendecki, M. J.; Jochymczyk, K.; Zuberek, W. M.; Tomaszewska, R.
Determination of Elastic Parameters of Near-Surface Layers Over Subsidence Trough Development During Longwall Exploitation Journal Article
In: Archives of Mining Sciences, vol. 62, no. 4, pp. 705-716, 2017, ISSN: 08607001.
@article{2-s2.0-85040928763,
title = {Determination of Elastic Parameters of Near-Surface Layers Over Subsidence Trough Development During Longwall Exploitation},
author = { M.J. Mendecki and K. Jochymczyk and W.M. Zuberek and R. Tomaszewska},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040928763&doi=10.1515%2famsc-2017-0050&partnerID=40&md5=573005f337d213ff300a8280ee86d2d9},
doi = {10.1515/amsc-2017-0050},
issn = {08607001},
year = {2017},
date = {2017-01-01},
journal = {Archives of Mining Sciences},
volume = {62},
number = {4},
pages = {705-716},
publisher = {Walter de Gruyter GmbH},
abstract = {Seismic and geodetic studies were carried out before, during, and after underground exploitation of a coal bed in Katowice - Kleofas Coal Mine, located in the Upper Silesia Coal Basin, Poland. Development of a subsidence trough was completed approximately 3 months after passage of a longwall exploitation in the coal seam. This was the time required for the subsidence trough to appear on the surface, which was confirmed by levelling measurements. Sharp changes in the elastic parameters were observed on each profile during subsidence trough development. This observation can result from changing tension and compression forces caused by increase and/or decrease of the elastic parameters of the rock mass. After completion of subsidence trough development, the rock mass appeared to return to its isotropic state and the observed changes ceased. Some minor fluctuations were noted, but they probably resulted from changes in groundwater levels, which might have affected the measured parameters. © 2018 Archives of Mining Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Seismic and geodetic studies were carried out before, during, and after underground exploitation of a coal bed in Katowice - Kleofas Coal Mine, located in the Upper Silesia Coal Basin, Poland. Development of a subsidence trough was completed approximately 3 months after passage of a longwall exploitation in the coal seam. This was the time required for the subsidence trough to appear on the surface, which was confirmed by levelling measurements. Sharp changes in the elastic parameters were observed on each profile during subsidence trough development. This observation can result from changing tension and compression forces caused by increase and/or decrease of the elastic parameters of the rock mass. After completion of subsidence trough development, the rock mass appeared to return to its isotropic state and the observed changes ceased. Some minor fluctuations were noted, but they probably resulted from changes in groundwater levels, which might have affected the measured parameters. © 2018 Archives of Mining Sciences.
Wojtecki, Ł.; Mendecki, M. J.; Zuberek, W. M.
Determination of Destress Blasting Effectiveness Using Seismic Source Parameters Journal Article
In: Rock Mechanics and Rock Engineering, vol. 50, no. 12, pp. 3233-3244, 2017, ISSN: 07232632, (19).
@article{2-s2.0-85028340223,
title = {Determination of Destress Blasting Effectiveness Using Seismic Source Parameters},
author = { Ł. Wojtecki and M.J. Mendecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028340223&doi=10.1007%2fs00603-017-1297-9&partnerID=40&md5=d7028e610ce72205e260d902bf2f3021},
doi = {10.1007/s00603-017-1297-9},
issn = {07232632},
year = {2017},
date = {2017-01-01},
journal = {Rock Mechanics and Rock Engineering},
volume = {50},
number = {12},
pages = {3233-3244},
publisher = {Springer-Verlag Wien},
abstract = {Underground mining of coal seams in the Upper Silesian Coal Basin is currently performed under difficult geological and mining conditions. The mining depth, dislocations (faults and folds) and mining remnants are responsible for rockburst hazard in the highest degree. This hazard can be minimized by using active rockburst prevention, where destress blastings play an important role. Destress blastings in coal seams aim to destress the local stress concentrations. These blastings are usually performed from the longwall face to decrease the stress level ahead of the longwall. An accurate estimation of active rockburst prevention effectiveness is important during mining under disadvantageous geological and mining conditions, which affect the risk of rockburst. Seismic source parameters characterize the focus of tremor, which may be useful in estimating the destress blasting effects. Investigated destress blastings were performed in coal seam no. 507 during its longwall mining in one of the coal mines in the Upper Silesian Coal Basin under difficult geological and mining conditions. The seismic source parameters of the provoked tremors were calculated. The presented preliminary investigations enable a rapid estimation of the destress blasting effectiveness using seismic source parameters, but further analysis in other geological and mining conditions with other blasting parameters is required. © 2017, The Author(s).},
note = {19},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Underground mining of coal seams in the Upper Silesian Coal Basin is currently performed under difficult geological and mining conditions. The mining depth, dislocations (faults and folds) and mining remnants are responsible for rockburst hazard in the highest degree. This hazard can be minimized by using active rockburst prevention, where destress blastings play an important role. Destress blastings in coal seams aim to destress the local stress concentrations. These blastings are usually performed from the longwall face to decrease the stress level ahead of the longwall. An accurate estimation of active rockburst prevention effectiveness is important during mining under disadvantageous geological and mining conditions, which affect the risk of rockburst. Seismic source parameters characterize the focus of tremor, which may be useful in estimating the destress blasting effects. Investigated destress blastings were performed in coal seam no. 507 during its longwall mining in one of the coal mines in the Upper Silesian Coal Basin under difficult geological and mining conditions. The seismic source parameters of the provoked tremors were calculated. The presented preliminary investigations enable a rapid estimation of the destress blasting effectiveness using seismic source parameters, but further analysis in other geological and mining conditions with other blasting parameters is required. © 2017, The Author(s).
Wojtecki, Ł.; Konicek, P.; Mendecki, M. J.; Zuberek, W. M.
Application of Seismic Parameters for Estimation of Destress Blasting Effectiveness Proceedings
Elsevier Ltd, vol. 191, 2017, ISSN: 18777058, (7).
@proceedings{2-s2.0-85022223641,
title = {Application of Seismic Parameters for Estimation of Destress Blasting Effectiveness},
author = { Ł. Wojtecki and P. Konicek and M.J. Mendecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85022223641&doi=10.1016%2fj.proeng.2017.05.241&partnerID=40&md5=7f434dcb97730655be254c2d234512a6},
doi = {10.1016/j.proeng.2017.05.241},
issn = {18777058},
year = {2017},
date = {2017-01-01},
journal = {Procedia Engineering},
volume = {191},
pages = {750-760},
publisher = {Elsevier Ltd},
abstract = {Coal seams in the Upper Silesian Coal Basin are currently extracted under more and more disadvantageous geological and mining conditions. Mining depth, geological dislocations and mining remnants are factors which affect the rockburst hazard during underground mining to the greatest extent. This hazard can be minimized by employment of active rockburst prevention, where long-hole destress blasts in roof rocks (torpedo blasts) have an important role. The main goal of these blastings is to either destress local stress concentrations in rock mass and to fracture the thick layers of strong roof rocks to prevent or minimize the impact of high energy tremors on the excavations. Sometimes, these blastings are performed to make the roof rocks caving behind the longwall face easier. The efficiency of blasting is typically evaluated from the seismic effect, which is calculated based on seismic monitoring data (seismic energy) and the weight of the charged explosive. This method, as used previously in the Czech Republic, was adopted in a selected Polish hard coal mine in the Upper Silesian Coal Basin. This method enables rapid and easy estimation of destress blasting effectiveness, adjusted to conditions occurring in the designed colliery. Destress blasts effectiveness may be evaluated via the seismic source parameters analysis as well, as was carried out in the selected colliery in the Polish part of the Upper Silesian Coal Basin. These parameters provide information, for example, on its size, state of stress and occurrence of slip mechanism in the source of provoked tremors. Long-hole destress blasting effectiveness in selected colliery has been evaluated using the seismic effect method and seismic source parameters analysis. The results were compared with each other and conditions were observed in situ. © 2017 The Authors.},
note = {7},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Coal seams in the Upper Silesian Coal Basin are currently extracted under more and more disadvantageous geological and mining conditions. Mining depth, geological dislocations and mining remnants are factors which affect the rockburst hazard during underground mining to the greatest extent. This hazard can be minimized by employment of active rockburst prevention, where long-hole destress blasts in roof rocks (torpedo blasts) have an important role. The main goal of these blastings is to either destress local stress concentrations in rock mass and to fracture the thick layers of strong roof rocks to prevent or minimize the impact of high energy tremors on the excavations. Sometimes, these blastings are performed to make the roof rocks caving behind the longwall face easier. The efficiency of blasting is typically evaluated from the seismic effect, which is calculated based on seismic monitoring data (seismic energy) and the weight of the charged explosive. This method, as used previously in the Czech Republic, was adopted in a selected Polish hard coal mine in the Upper Silesian Coal Basin. This method enables rapid and easy estimation of destress blasting effectiveness, adjusted to conditions occurring in the designed colliery. Destress blasts effectiveness may be evaluated via the seismic source parameters analysis as well, as was carried out in the selected colliery in the Polish part of the Upper Silesian Coal Basin. These parameters provide information, for example, on its size, state of stress and occurrence of slip mechanism in the source of provoked tremors. Long-hole destress blasting effectiveness in selected colliery has been evaluated using the seismic effect method and seismic source parameters analysis. The results were compared with each other and conditions were observed in situ. © 2017 The Authors.
2016
Wojtecki, Ł.; Knopik, M.; Zuberek, W. M.
The Influence of a Local Fault Zone on High Energy Tremor Occurrence during Longwall Mining of a Coal Seam Journal Article
In: Acta Geophysica, vol. 64, no. 4, pp. 1164-1175, 2016, ISSN: 18956572, (7).
@article{2-s2.0-84984973615,
title = {The Influence of a Local Fault Zone on High Energy Tremor Occurrence during Longwall Mining of a Coal Seam},
author = { Ł. Wojtecki and M. Knopik and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84984973615&doi=10.1515%2facgeo-2016-0040&partnerID=40&md5=2a2aba9884f7f4304a16dd4e4fda7bd1},
doi = {10.1515/acgeo-2016-0040},
issn = {18956572},
year = {2016},
date = {2016-01-01},
journal = {Acta Geophysica},
volume = {64},
number = {4},
pages = {1164-1175},
publisher = {De Gruyter Open Ltd},
abstract = {Underground mining of coal seams in the Upper Silesian Coal Basin in Poland is accompanied by seismic activity of varying magnitude. The investigations which have been performed for several years distinguished high energy mine tremors connected directly with mining or coupled with geological structures, such as large faults. In mined seams, local fault zones occur. Faults in these zones are usually small, with throws comparable with coal seams thicknesses. Local fault zone may be responsible for the occurrence of high energy tremors as well as large faults, as presented in this article. An analysis of source mechanism of high energy tremors generated during longwall mining of the coal seam No. 510, with presence of a local fault zone, in one of the Polish hard coal mines in the Upper Silesian Coal Basin was performed. For this purpose, the seismic moment tensor inversion method was used. In most of foci, the process of shear predominated. Determined nodal plane parameters were correlated with parameters of faults forming the local fault zone. High energy tremors were generated mostly by dislocations on faults of the local fault zone. Weakening of roof rocks in the neighborhood of local fault zone takes an important role too, and was responsible for share of implosion in the focal mechanism. © 2016 Wojtecki et al.},
note = {7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Underground mining of coal seams in the Upper Silesian Coal Basin in Poland is accompanied by seismic activity of varying magnitude. The investigations which have been performed for several years distinguished high energy mine tremors connected directly with mining or coupled with geological structures, such as large faults. In mined seams, local fault zones occur. Faults in these zones are usually small, with throws comparable with coal seams thicknesses. Local fault zone may be responsible for the occurrence of high energy tremors as well as large faults, as presented in this article. An analysis of source mechanism of high energy tremors generated during longwall mining of the coal seam No. 510, with presence of a local fault zone, in one of the Polish hard coal mines in the Upper Silesian Coal Basin was performed. For this purpose, the seismic moment tensor inversion method was used. In most of foci, the process of shear predominated. Determined nodal plane parameters were correlated with parameters of faults forming the local fault zone. High energy tremors were generated mostly by dislocations on faults of the local fault zone. Weakening of roof rocks in the neighborhood of local fault zone takes an important role too, and was responsible for share of implosion in the focal mechanism. © 2016 Wojtecki et al.
Wojtecki, Ł.; Mendecki, M. J.; Zuberek, W. M.
The seismic source parameters of tremors provoked by destress blastings in coal seam Journal Article
In: Journal of Mining Science, vol. 52, no. 2, pp. 258-264, 2016, ISSN: 10627391, (3).
@article{2-s2.0-84995550681,
title = {The seismic source parameters of tremors provoked by destress blastings in coal seam},
author = { Ł. Wojtecki and M.J. Mendecki and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84995550681&doi=10.1134%2fS1062739116020382&partnerID=40&md5=9ae9bdf5e3cd7d3b5cd44a515df9398e},
doi = {10.1134/S1062739116020382},
issn = {10627391},
year = {2016},
date = {2016-01-01},
journal = {Journal of Mining Science},
volume = {52},
number = {2},
pages = {258-264},
publisher = {Springer New York LLC},
abstract = {Underground mining of coal seams in the Upper Silesian Coal Basin is currently being carried out under difficult geological and mining conditions. Rockburst hazard can be minimized via the use of active rockburst prevention, where destress blastings take an important role, especially during mining under disadvantageous geological and mining conditions. Presented paper shows how seismic source parameters may be useful to study destress blastings effects. Destress blastings were performed in coal seam no. 510 during longwall mining of coal seam no. 510 in one of the coal mines in the Upper Silesian Coal Basin. The presented preliminary investigations have given possibility for rapid estimation of destress blasting effectiveness with the use of seismic source parameters, but further analysis under other geological and mining conditions and other blasting parameters is needed. © 2016, Pleiades Publishing, Ltd.},
note = {3},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Underground mining of coal seams in the Upper Silesian Coal Basin is currently being carried out under difficult geological and mining conditions. Rockburst hazard can be minimized via the use of active rockburst prevention, where destress blastings take an important role, especially during mining under disadvantageous geological and mining conditions. Presented paper shows how seismic source parameters may be useful to study destress blastings effects. Destress blastings were performed in coal seam no. 510 during longwall mining of coal seam no. 510 in one of the coal mines in the Upper Silesian Coal Basin. The presented preliminary investigations have given possibility for rapid estimation of destress blasting effectiveness with the use of seismic source parameters, but further analysis under other geological and mining conditions and other blasting parameters is needed. © 2016, Pleiades Publishing, Ltd.
Wojtecki, Ł.; Mendecki, M. J.; Zuberek, W. M.; Knopik, M.
An attempt to determine the seismic moment tensor of tremors induced by destress blasting in a coal seam Journal Article
In: International Journal of Rock Mechanics and Mining Sciences, vol. 83, pp. 162-169, 2016, ISSN: 13651609, (23).
@article{2-s2.0-84954159804,
title = {An attempt to determine the seismic moment tensor of tremors induced by destress blasting in a coal seam},
author = { Ł. Wojtecki and M.J. Mendecki and W.M. Zuberek and M. Knopik},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954159804&doi=10.1016%2fj.ijrmms.2016.01.002&partnerID=40&md5=0380cb7c6e59017ee733750894564f11},
doi = {10.1016/j.ijrmms.2016.01.002},
issn = {13651609},
year = {2016},
date = {2016-01-01},
journal = {International Journal of Rock Mechanics and Mining Sciences},
volume = {83},
pages = {162-169},
publisher = {Elsevier Ltd},
abstract = {[No abstract available]},
note = {23},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
[No abstract available]
2013
Wojtecki, Ł.; Mendecki, M. J.; Talaga, A.; Zuberek, W. M.
International Society for Rock Mechanics, 2013, ISBN: 9781138000803, (5).
@proceedings{2-s2.0-85059413106,
title = {The estimation of the effectiveness of torpedo blasting based on an analysis of focal mechanisms of induced mining tremors in the Bielszowice coal mine},
author = { Ł. Wojtecki and M.J. Mendecki and A. Talaga and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059413106&doi=10.1201%2fb15683-131&partnerID=40&md5=0a5a4a962ff9b7c6f7e668df5b6df369},
doi = {10.1201/b15683-131},
isbn = {9781138000803},
year = {2013},
date = {2013-01-01},
journal = {ISRM International Symposium - EUROCK 2013},
pages = {769-773},
publisher = {International Society for Rock Mechanics},
abstract = {Coal exploitation in the Upper Silesian Coal Basin is associated with rockburst hazard. This hazard is minimalized by active rockburst prevention, where torpedo blastings in roof-rocks take very important place. The estimation of the torpedo blasting effectiveness becomes significant under exploitation in difficult geological and mining conditions, where the high danger of rockburst occurs. Pioneer investigations lead to estimate of the torpedo blastings effectiveness on the basis of an analysis of focal mechanisms of the induced mining tremors. The study has been carried out in the Bielszowice coal mine in cooperation with the Faculty of Earth Sciences of the University of Silesia. The torpedo blastings were performed during exploitation of the seam 507 with the longwall 307b. Each blasting provoked a tremor immediately. The parameters of the focal mechanisms for each provoked event were estimated by the FOCI software. Beside tremors foci with an explosive mechanism, related only to the detonation of an explosive, the occurrence of tremor foci with a shear mechanism has been confirmed. Shear mechanism in provoked tremors proves that blastings caused the motion of rock masses, what is connected with stress drop in the rock mass. The results have been associated with geological and mining conditions. © 2013 Taylor & Francis Group, London.},
note = {5},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Coal exploitation in the Upper Silesian Coal Basin is associated with rockburst hazard. This hazard is minimalized by active rockburst prevention, where torpedo blastings in roof-rocks take very important place. The estimation of the torpedo blasting effectiveness becomes significant under exploitation in difficult geological and mining conditions, where the high danger of rockburst occurs. Pioneer investigations lead to estimate of the torpedo blastings effectiveness on the basis of an analysis of focal mechanisms of the induced mining tremors. The study has been carried out in the Bielszowice coal mine in cooperation with the Faculty of Earth Sciences of the University of Silesia. The torpedo blastings were performed during exploitation of the seam 507 with the longwall 307b. Each blasting provoked a tremor immediately. The parameters of the focal mechanisms for each provoked event were estimated by the FOCI software. Beside tremors foci with an explosive mechanism, related only to the detonation of an explosive, the occurrence of tremor foci with a shear mechanism has been confirmed. Shear mechanism in provoked tremors proves that blastings caused the motion of rock masses, what is connected with stress drop in the rock mass. The results have been associated with geological and mining conditions. © 2013 Taylor & Francis Group, London.
Żogała, B.; Mendecki, M. J.; Zuberek, W. M.; Gołębiowski, T.; Antonik, W.
Determination of the extent of fractured zones around mine openings using the resistivity and GPR methods Proceedings
International Society for Rock Mechanics, 2013, ISBN: 9781138000803, (1).
@proceedings{2-s2.0-85048738448,
title = {Determination of the extent of fractured zones around mine openings using the resistivity and GPR methods},
author = { B. Żogała and M.J. Mendecki and W.M. Zuberek and T. Gołębiowski and W. Antonik},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048738448&doi=10.1201%2fb15683-28&partnerID=40&md5=cbba6c9c59f17af8b1f73a010905faf5},
doi = {10.1201/b15683-28},
isbn = {9781138000803},
year = {2013},
date = {2013-01-01},
journal = {ISRM International Symposium - EUROCK 2013},
pages = {181-186},
publisher = {International Society for Rock Mechanics},
abstract = {The goal of research was to determine the spatial distribution of the fractures and to recognize the electric properties of the rock mass around the mining openings in the O/ZG “Polkowice – Sieroszowice” underground copper mine (the Lower Silesian region; Poland). The measurements were carried out with the multielectrode resistivity ABEM Lund Imaging system and georadar equipment produced by MALA Geoscience. The measurements were conducted on the side walls of the two selected mining openings, i.e. inclined drift A5F and dip road D2. On each side wall 3 measurement profiles of the 40 m length were designed. The profiles were located in the lower, middle and upper parts of the side walls. Applying inverse combined algorithm the resistivity changes were recognized to the depth of approx. 8 m from the side walls. The results of resistivity imaging have indicated the occurrence of the increasing resistivity zones in the vicinity of the side walls. They can be related to the fractured and loose zones of the rock mass. The obtained resistivity values change in the range from approx. 15 Ωm to over 100 Ωm. It has also been observed that the depth of the fractured zones changes and depends on the side walls height. In the both openings the fractured zones extensions increased up to 6–7 m of depth near the roofs and were the lowest near the floors, reaching 2–3 m. The deeper, not disturbed zones of the rock mass showed the resistivity below 10 Ωm. The GPR reflection measurements with the use of 500 MHz and 250 MHz antennas delivered information about fractured zones distribution to the depth of 5.0 m and 10.0 m, respectively. The results of measurements obtained for the both antennas were similar, therefore in the paper only recordings for 250 MHz antenna are presented. The results of GPR surveys were correlated to the depth of about 8 m with the results obtained for the resistivity method. The majority of fractures has been located by the GPR method near the openings’ roofs in this way confirmed the results from the resistivity method. © 2013 Taylor & Francis Group, London.},
note = {1},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
The goal of research was to determine the spatial distribution of the fractures and to recognize the electric properties of the rock mass around the mining openings in the O/ZG “Polkowice – Sieroszowice” underground copper mine (the Lower Silesian region; Poland). The measurements were carried out with the multielectrode resistivity ABEM Lund Imaging system and georadar equipment produced by MALA Geoscience. The measurements were conducted on the side walls of the two selected mining openings, i.e. inclined drift A5F and dip road D2. On each side wall 3 measurement profiles of the 40 m length were designed. The profiles were located in the lower, middle and upper parts of the side walls. Applying inverse combined algorithm the resistivity changes were recognized to the depth of approx. 8 m from the side walls. The results of resistivity imaging have indicated the occurrence of the increasing resistivity zones in the vicinity of the side walls. They can be related to the fractured and loose zones of the rock mass. The obtained resistivity values change in the range from approx. 15 Ωm to over 100 Ωm. It has also been observed that the depth of the fractured zones changes and depends on the side walls height. In the both openings the fractured zones extensions increased up to 6–7 m of depth near the roofs and were the lowest near the floors, reaching 2–3 m. The deeper, not disturbed zones of the rock mass showed the resistivity below 10 Ωm. The GPR reflection measurements with the use of 500 MHz and 250 MHz antennas delivered information about fractured zones distribution to the depth of 5.0 m and 10.0 m, respectively. The results of measurements obtained for the both antennas were similar, therefore in the paper only recordings for 250 MHz antenna are presented. The results of GPR surveys were correlated to the depth of about 8 m with the results obtained for the resistivity method. The majority of fractures has been located by the GPR method near the openings’ roofs in this way confirmed the results from the resistivity method. © 2013 Taylor & Francis Group, London.
2012
Żogała, B.; Mendecki, M. J.; Zuberek, W. M.; Robak, M.
Application of self potential method in the area contaminated with oil derivatives Journal Article
In: Acta Geodynamica et Geomaterialia, vol. 9, no. 2, pp. 179-189, 2012, ISSN: 12149705, (6).
@article{2-s2.0-84863843135,
title = {Application of self potential method in the area contaminated with oil derivatives},
author = { B. Żogała and M.J. Mendecki and W.M. Zuberek and M. Robak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84863843135&partnerID=40&md5=0c6e2101f3c7e216e50ffa9f48885469},
issn = {12149705},
year = {2012},
date = {2012-01-01},
journal = {Acta Geodynamica et Geomaterialia},
volume = {9},
number = {2},
pages = {179-189},
abstract = {Oil derivatives contamination of soils effects in changes of many physical properties of soil such as: electrical resistivity, conductivity and self potential (SP) as well. Thus the measurable anomalies of these properties are possible to detect with geoelectrical measurements. SP geoelectrical measurements were carried out in the area of controlled oil spill. The oil was spilled into vadose zone of dry sands. The first underground water level was observed at the depth of 10 m. The measurements were carried out along 20 m long profile situated above 3 m long contaminated zone. The part of contaminated zone (1.5 m) had been subjected to bioremediation process with yeasts Yarrowia lipolytica since 4 months. In the border of contaminated zone and biodegradated one chemical gradient was developed and significant increase of self potentials values can be observed. The measurements were carried out with potential gradient method. Lund Imaging System equipment and non-polarizable electrodes (Cu/CuSO 4) were applied. Above contaminated and biodegraded zone distinct SP anomaly (10-20 mV) was measured. The anomaly correlates with results of EM, resistivity imaging and induced polarization investigations.},
note = {6},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Oil derivatives contamination of soils effects in changes of many physical properties of soil such as: electrical resistivity, conductivity and self potential (SP) as well. Thus the measurable anomalies of these properties are possible to detect with geoelectrical measurements. SP geoelectrical measurements were carried out in the area of controlled oil spill. The oil was spilled into vadose zone of dry sands. The first underground water level was observed at the depth of 10 m. The measurements were carried out along 20 m long profile situated above 3 m long contaminated zone. The part of contaminated zone (1.5 m) had been subjected to bioremediation process with yeasts Yarrowia lipolytica since 4 months. In the border of contaminated zone and biodegradated one chemical gradient was developed and significant increase of self potentials values can be observed. The measurements were carried out with potential gradient method. Lund Imaging System equipment and non-polarizable electrodes (Cu/CuSO 4) were applied. Above contaminated and biodegraded zone distinct SP anomaly (10-20 mV) was measured. The anomaly correlates with results of EM, resistivity imaging and induced polarization investigations.
2009
Żogała, B.; Dubiel, R.; Zuberek, W. M.; Steininger, M.; Wzientek, K.; Robak, M.
Geoelectrical methods for detection of oil contaminations in soils and bioremediation process monitoring Proceedings
vol. 1, 2009, ISSN: 15548015, (4).
@proceedings{2-s2.0-84867258325,
title = {Geoelectrical methods for detection of oil contaminations in soils and bioremediation process monitoring},
author = { B. Żogała and R. Dubiel and W.M. Zuberek and M. Steininger and K. Wzientek and M. Robak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867258325&partnerID=40&md5=0127aa47a51dd56183e09c52fac0a7fa},
issn = {15548015},
year = {2009},
date = {2009-01-01},
journal = {Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP},
volume = {1},
pages = {367-381},
abstract = {The goal of the experiment was to verify the geoelectrical methods as a tool for detection of oil contaminations in soils and to monitor their bioremediation process. The survey area of approximately 2000 m2 is situated in the former military camp Borne Sulinowo in NW Poland. The area is covered by fluvioglacial sediments composed of sands and gravels with the first water level at the 11 12 m depth. Numerous shallow bore-holes were drilled to recognize the detailed geological structure. The measurements with conductivity meter (Geonics EM-31Mk2) and resistivity Lund Imaging System were carried out and soils samples were taken for laboratory tests in fall 2007. Then 70 litres of diesel fuel was spilled on the 3m2 area and in this way introduced into the soil. The geophysical measurements and laboratory tests were repeated. The measurements showed the distinct anomaly of resistivity or apparent conductivity related to oil contamination of soil. In order to carry out the bioremediation process the Yarrowia Lipolytica yeast were introduced into the contaminated soil in spring 2008. Then, the bioremediation was observed and monitored by EM, resistivity imaging measurements and laboratory tests of soil samples.},
note = {4},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
The goal of the experiment was to verify the geoelectrical methods as a tool for detection of oil contaminations in soils and to monitor their bioremediation process. The survey area of approximately 2000 m2 is situated in the former military camp Borne Sulinowo in NW Poland. The area is covered by fluvioglacial sediments composed of sands and gravels with the first water level at the 11 12 m depth. Numerous shallow bore-holes were drilled to recognize the detailed geological structure. The measurements with conductivity meter (Geonics EM-31Mk2) and resistivity Lund Imaging System were carried out and soils samples were taken for laboratory tests in fall 2007. Then 70 litres of diesel fuel was spilled on the 3m2 area and in this way introduced into the soil. The geophysical measurements and laboratory tests were repeated. The measurements showed the distinct anomaly of resistivity or apparent conductivity related to oil contamination of soil. In order to carry out the bioremediation process the Yarrowia Lipolytica yeast were introduced into the contaminated soil in spring 2008. Then, the bioremediation was observed and monitored by EM, resistivity imaging measurements and laboratory tests of soil samples.
Żogała, B.; Dubiel, R.; Zuberek, W. M.; Rusin-Zogala, M.; Steininger, M.
Geoelectrical investigation of oil contaminated soils in former underground fuel base: Borne Sulinowo, NW Poland Journal Article
In: Environmental Geology, vol. 58, no. 1, pp. 1-9, 2009, ISSN: 09430105, (14).
@article{2-s2.0-67651107320,
title = {Geoelectrical investigation of oil contaminated soils in former underground fuel base: Borne Sulinowo, NW Poland},
author = { B. Żogała and R. Dubiel and W.M. Zuberek and M. Rusin-Zogala and M. Steininger},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-67651107320&doi=10.1007%2fs00254-008-1458-y&partnerID=40&md5=a8a43e3b383a3736bc87fddfc929ec9a},
doi = {10.1007/s00254-008-1458-y},
issn = {09430105},
year = {2009},
date = {2009-01-01},
journal = {Environmental Geology},
volume = {58},
number = {1},
pages = {1-9},
abstract = {The survey has been carried out in the area of 0.23 km2 of the former military underground fuel base. The oil derivative products were observed in excavations and the laboratory tests confirmed the occurrence of hydrocarbons (>C12) in soils. The purpose of the survey was to determine the spatial extent of the contamination. The studied area is covered by postglacial sediments: sands, gravels and till. The first water table was observed at a depth of 10-12 m. The detailed electromagnetic measurements with Geonics EM31-MK2 conductivity meter were performed in the whole area of the former fuel base. Obtained results were elaborated statistically and the map of apparent electrical conductivity to a depth of 6 m was created. Many local low conductivity anomalies were observed. The measurements with Geonics EM34-3XL were performed along one A-profile and 1D electromagnetic modelling along with this profile was calculated to obtain the electrical conductivity cross-section to a depth of 30 m. Two-dimensional electrical resistivity imaging measurements were carried out along the same profile and the resistivity cross-section to a depth of 20 m was performed. Both conducivity and resistivity cross-sections show anomalous zones. The zones correlate with oil contaminated zones very well. © 2008 Springer-Verlag.},
note = {14},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The survey has been carried out in the area of 0.23 km2 of the former military underground fuel base. The oil derivative products were observed in excavations and the laboratory tests confirmed the occurrence of hydrocarbons (>C12) in soils. The purpose of the survey was to determine the spatial extent of the contamination. The studied area is covered by postglacial sediments: sands, gravels and till. The first water table was observed at a depth of 10-12 m. The detailed electromagnetic measurements with Geonics EM31-MK2 conductivity meter were performed in the whole area of the former fuel base. Obtained results were elaborated statistically and the map of apparent electrical conductivity to a depth of 6 m was created. Many local low conductivity anomalies were observed. The measurements with Geonics EM34-3XL were performed along one A-profile and 1D electromagnetic modelling along with this profile was calculated to obtain the electrical conductivity cross-section to a depth of 30 m. Two-dimensional electrical resistivity imaging measurements were carried out along the same profile and the resistivity cross-section to a depth of 20 m was performed. Both conducivity and resistivity cross-sections show anomalous zones. The zones correlate with oil contaminated zones very well. © 2008 Springer-Verlag.
2008
Idziak, A. F.; Zuberek, W. M.
Geophysical studies at the University of Silesia [Studia geofizyczne na Uniwersytecie Śla̧skim] Journal Article
In: Przeglad Geofizyczny, vol. 53, no. 2, pp. 195-200, 2008, ISSN: 00332135.
@article{2-s2.0-84859739463,
title = {Geophysical studies at the University of Silesia [Studia geofizyczne na Uniwersytecie Śla̧skim]},
author = { A.F. Idziak and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859739463&partnerID=40&md5=4f9b8c53ee391abf43bd957696eb33d8},
issn = {00332135},
year = {2008},
date = {2008-01-01},
journal = {Przeglad Geofizyczny},
volume = {53},
number = {2},
pages = {195-200},
abstract = {In the academic year 2008/2009 the Faculty of Earth Sciences together with Faculty of Mathematics, Physics and Chemistry (the Institute of Physics) of the University of Silesia open the autonomic, interdepartamental two-stage study system of education in geophysics including the Bachelor's level (three years) and Master's level (additional two years). Up to now education in geology or geophysics with speciality of geophysics has been provided. Students are awarded MSc degree either in geology or in physics depending on the place they chose to submit their MSc theses. The graduates can find a job and they have a good reputation and opinion therefore the idea of opening the geophysical education at the University of Silesia has appeared useful and advisable.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the academic year 2008/2009 the Faculty of Earth Sciences together with Faculty of Mathematics, Physics and Chemistry (the Institute of Physics) of the University of Silesia open the autonomic, interdepartamental two-stage study system of education in geophysics including the Bachelor's level (three years) and Master's level (additional two years). Up to now education in geology or geophysics with speciality of geophysics has been provided. Students are awarded MSc degree either in geology or in physics depending on the place they chose to submit their MSc theses. The graduates can find a job and they have a good reputation and opinion therefore the idea of opening the geophysical education at the University of Silesia has appeared useful and advisable.
Frej, A.; Zuberek, W. M.
Local effects in peak accelerations caused by mining tremors in bytom syncline region (upper silesia) Proceedings
vol. 5, no. 2, 2008, ISSN: 12149705, (8).
@proceedings{2-s2.0-77953749967,
title = {Local effects in peak accelerations caused by mining tremors in bytom syncline region (upper silesia)},
author = { A. Frej and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77953749967&partnerID=40&md5=fa523b04e8b500c78ebc81c0e54cd6d7},
issn = {12149705},
year = {2008},
date = {2008-01-01},
journal = {Acta Geodynamica et Geomaterialia},
volume = {5},
number = {2},
pages = {115-122},
abstract = {This paper shows how the local effects can change the value of maximum accelerations from mining-induced tremors. The analysis was carried out basing on data collected from acceleration stations installed in Bytom Syncline region (Upper Silesia). The estimation of the local effects was obtained on the basis of deviations from the attenuation relation. The accelerograms were recorded from the mining tremors in low seismic energy range and in epicentral distances in the range from 500m to 5000m. The obtained results were correlated with results from Horizontal to Vertical Spectral Ratio (HVSR) technique. This method is based on simple theoretical foundation and is commonly used in natural seismicity studies. Our results show that the H/V ratio technique gives a reasonable estimate of the surface amplification for frequency range between about 2 and 8 Hz. In case of simple geology and when the signal to noise is adequately high the results are the best. All the results show that there occur local effects.},
note = {8},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
This paper shows how the local effects can change the value of maximum accelerations from mining-induced tremors. The analysis was carried out basing on data collected from acceleration stations installed in Bytom Syncline region (Upper Silesia). The estimation of the local effects was obtained on the basis of deviations from the attenuation relation. The accelerograms were recorded from the mining tremors in low seismic energy range and in epicentral distances in the range from 500m to 5000m. The obtained results were correlated with results from Horizontal to Vertical Spectral Ratio (HVSR) technique. This method is based on simple theoretical foundation and is commonly used in natural seismicity studies. Our results show that the H/V ratio technique gives a reasonable estimate of the surface amplification for frequency range between about 2 and 8 Hz. In case of simple geology and when the signal to noise is adequately high the results are the best. All the results show that there occur local effects.
Żogała, B.; Dubiel, R.; Wandowski, J. Le; Zuberek, W. M.; Gąska, G.
Application of resistivity imaging method for investigation of geologic structure of pleistocene sediments Proceedings
vol. 5, no. 2, 2008, ISSN: 12149705, (6).
@proceedings{2-s2.0-77953739298,
title = {Application of resistivity imaging method for investigation of geologic structure of pleistocene sediments},
author = { B. Żogała and R. Dubiel and J. Le Wandowski and W.M. Zuberek and G. Gąska},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77953739298&partnerID=40&md5=a549c3e3949017b21de92ee03f63dc8c},
issn = {12149705},
year = {2008},
date = {2008-01-01},
journal = {Acta Geodynamica et Geomaterialia},
volume = {5},
number = {2},
pages = {177-183},
abstract = {This paper presents the results of geophysical survey performed in the Pilawa River valley in the area of Middle Pomerania (Poland). The resistivity imaging method was applied. Resistivity profile measuring eight hundred metres allowed to investigate the geologic structure to the depth of 150 metres. The resistivity cross section shows the structure of Pleistocene sediments and the depth of Miocene - Pleistocene boundary. The significant lowering of the boundary is related to assumable ice-sheet margin range of Pomeranian phase of North Polish Glaciation. The lowering of the boundary may be a result of sediments compaction and the subglacial tunnel slope as well.},
note = {6},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
This paper presents the results of geophysical survey performed in the Pilawa River valley in the area of Middle Pomerania (Poland). The resistivity imaging method was applied. Resistivity profile measuring eight hundred metres allowed to investigate the geologic structure to the depth of 150 metres. The resistivity cross section shows the structure of Pleistocene sediments and the depth of Miocene - Pleistocene boundary. The significant lowering of the boundary is related to assumable ice-sheet margin range of Pomeranian phase of North Polish Glaciation. The lowering of the boundary may be a result of sediments compaction and the subglacial tunnel slope as well.
Żogała, B.; Dubiel, R.; Robak, M.; Zuberek, W. M.; Wzientek, K.
European Association of Geoscientists and Engineers, EAGE, 2008, (2).
@proceedings{2-s2.0-85085775078,
title = {Observations of the bioremediation of oil contaminated soils - Application of EM and resistivity imaging methods},
author = { B. Żogała and R. Dubiel and M. Robak and W.M. Zuberek and K. Wzientek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85085775078&doi=10.3997%2f2214-4609.20146259&partnerID=40&md5=2820425a8f6ddfb0ef528613a18b9a0b},
doi = {10.3997/2214-4609.20146259},
year = {2008},
date = {2008-01-01},
journal = {Near Surface 2008 - 14th European Meeting of Environmental and Engineering Geophysics},
publisher = {European Association of Geoscientists and Engineers, EAGE},
abstract = {The survey has been carried out in the area the former military underground fuel base situated in the firing ground Borne Sulinowo (NW Poland). The oil contaminations were revealed in 7 zones in the studied area. In 2003 and 2005 yeast strain Yarrowia lipolytica A-101 suspensions were introduced into shallow boreholes to intensify the bioremediation process. In succeeding seasons the bioremediation was observed and monitored using EM and resistivity imaging measurements. The study showed the significant measurable change in soil electrical properties after several months since the yeast suspension had been introduced into hydrocarbons contaminated soil. The bioremediation can be efficiently observed and monitored with geoelectrical methods such as resistivity imaging or electromagnetic induction ones.},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
The survey has been carried out in the area the former military underground fuel base situated in the firing ground Borne Sulinowo (NW Poland). The oil contaminations were revealed in 7 zones in the studied area. In 2003 and 2005 yeast strain Yarrowia lipolytica A-101 suspensions were introduced into shallow boreholes to intensify the bioremediation process. In succeeding seasons the bioremediation was observed and monitored using EM and resistivity imaging measurements. The study showed the significant measurable change in soil electrical properties after several months since the yeast suspension had been introduced into hydrocarbons contaminated soil. The bioremediation can be efficiently observed and monitored with geoelectrical methods such as resistivity imaging or electromagnetic induction ones.
2007
Poręba, A.; Zuberek, W. M.; Nogaj-Chachaj, J.; Kotyrba, A.; Siwek, S.
Archaeological objects in loesses recognized by GPR research at the site Karmanowice, Poland Journal Article
In: Acta Geophysica, vol. 55, no. 4, pp. 640-651, 2007, ISSN: 18956572, (2).
@article{2-s2.0-34748836348,
title = {Archaeological objects in loesses recognized by GPR research at the site Karmanowice, Poland},
author = { A. Poręba and W.M. Zuberek and J. Nogaj-Chachaj and A. Kotyrba and S. Siwek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34748836348&doi=10.2478%2fs11600-007-0024-4&partnerID=40&md5=55746f881a6ddbe818c10e330c7c0b03},
doi = {10.2478/s11600-007-0024-4},
issn = {18956572},
year = {2007},
date = {2007-01-01},
journal = {Acta Geophysica},
volume = {55},
number = {4},
pages = {640-651},
publisher = {Springer Verlag},
abstract = {The aim of the research was to examine subsurface soil layers with the use of the Ground Penetrating Radar (GPR) method. Neolithic archaeological post in Karmanowice was examined. On the basis of earlier geophysical researches and archaeological premises, eight measurement profiles had been chosen. Ground Penetrating Radar system with antenna of 500 MHz frequency was applied. The measurements were made with 30 and 60 ns time windows. The results were shown as the GPR sections. The analysis of the obtained results allowed us to outline anomalies connected with the appearance of archaeological objects in subsurface soil layers. The border between the anthropogenically changed upper layer and undisturbed loess was established, and the sections of slope wash layers were designated. Anomalies were confirmed by digging and test drillings. Additionally, 2D resistivity imaging method was used for verification of specific anthropogenic anomalies. © Institute of Geophysics, Polish Academy of Sciences 2007.},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of the research was to examine subsurface soil layers with the use of the Ground Penetrating Radar (GPR) method. Neolithic archaeological post in Karmanowice was examined. On the basis of earlier geophysical researches and archaeological premises, eight measurement profiles had been chosen. Ground Penetrating Radar system with antenna of 500 MHz frequency was applied. The measurements were made with 30 and 60 ns time windows. The results were shown as the GPR sections. The analysis of the obtained results allowed us to outline anomalies connected with the appearance of archaeological objects in subsurface soil layers. The border between the anthropogenically changed upper layer and undisturbed loess was established, and the sections of slope wash layers were designated. Anomalies were confirmed by digging and test drillings. Additionally, 2D resistivity imaging method was used for verification of specific anthropogenic anomalies. © Institute of Geophysics, Polish Academy of Sciences 2007.
2006
Bank, K.; Zuberek, W. M.
Concordance of tremor occurrence with poisson distribution in the Jas-Mos coal mine Proceedings
vol. 29, no. 395, 2006, ISSN: 0138015X.
@proceedings{2-s2.0-34247588216,
title = {Concordance of tremor occurrence with poisson distribution in the Jas-Mos coal mine},
author = { K. Bank and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34247588216&partnerID=40&md5=0925f462eacae2aaf37f28209832b1c8},
issn = {0138015X},
year = {2006},
date = {2006-01-01},
journal = {Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea},
volume = {29},
number = {395},
pages = {37-48},
abstract = {About 70 000 mining tremors recorded from 1989 to 2004 at the Jas-Mos coal mine have been analysed. The tremors had seismic energy in the range from 1.103 J to above 1.106 J. Statistical analysis of the concordance of empirical frequency of tremor occurrence distributions with Poisson distribution has been carried out, gradually decreasing the seismic energy discrimination level. Then the distributions of interevent time intervals have been determined verifying if they approached the exponential distribution. It is concluded that in all cases one might determine the energy discrimination levels above which the tremor occurrence approaches the Poisson process. This means that the occurrence of tremors is random, and the consequences concerning their prediction are briefly discussed.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
About 70 000 mining tremors recorded from 1989 to 2004 at the Jas-Mos coal mine have been analysed. The tremors had seismic energy in the range from 1.103 J to above 1.106 J. Statistical analysis of the concordance of empirical frequency of tremor occurrence distributions with Poisson distribution has been carried out, gradually decreasing the seismic energy discrimination level. Then the distributions of interevent time intervals have been determined verifying if they approached the exponential distribution. It is concluded that in all cases one might determine the energy discrimination levels above which the tremor occurrence approaches the Poisson process. This means that the occurrence of tremors is random, and the consequences concerning their prediction are briefly discussed.
2005
Żogała, B.; Dubiel, R.; Zuberek, W. M.; Wzientek, K.; Rusin-Zogala, M.
Geoelectrical monitoring of the bioremediation of hydrocarbons contaminated soils Proceedings
European Association of Geoscientists and Engineers, EAGE, 2005.
@proceedings{2-s2.0-84898621295,
title = {Geoelectrical monitoring of the bioremediation of hydrocarbons contaminated soils},
author = { B. Żogała and R. Dubiel and W.M. Zuberek and K. Wzientek and M. Rusin-Zogala},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898621295&partnerID=40&md5=347b3c9a4b653374a3d9b4d40860f231},
year = {2005},
date = {2005-01-01},
journal = {Near Surface 2005},
publisher = {European Association of Geoscientists and Engineers, EAGE},
abstract = {The paper presents the results of geoelectrical monitoring of the bioremediation of hydrocarbons contaminated soils. Yeast strain Yarrowia lipolytica A-101 suspension was introduced into one of hydrocarbons contaminated zones situated in fuel base of the former military firing ground Borne Sulinowo. The process of bioremediation was controlled using cyclical electromagnetic and resistivity imaging measurements. The increase in soil electrical conductivity and decrease in electrical resistivity were observed where the yeast suspension had been introduced.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
The paper presents the results of geoelectrical monitoring of the bioremediation of hydrocarbons contaminated soils. Yeast strain Yarrowia lipolytica A-101 suspension was introduced into one of hydrocarbons contaminated zones situated in fuel base of the former military firing ground Borne Sulinowo. The process of bioremediation was controlled using cyclical electromagnetic and resistivity imaging measurements. The increase in soil electrical conductivity and decrease in electrical resistivity were observed where the yeast suspension had been introduced.
Wzientek, K.; Żogała, B.; Zuberek, W. M.; Dubiel, R.; Rusin-Zogala, M.
The resistivity imaging survey of the chemical waste dumping site Proceedings
European Association of Geoscientists and Engineers, EAGE, 2005.
@proceedings{2-s2.0-84898605409,
title = {The resistivity imaging survey of the chemical waste dumping site},
author = { K. Wzientek and B. Żogała and W.M. Zuberek and R. Dubiel and M. Rusin-Zogala},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898605409&partnerID=40&md5=ba4353fb06e280d8afbeccb44cbc0251},
year = {2005},
date = {2005-01-01},
journal = {Near Surface 2005},
publisher = {European Association of Geoscientists and Engineers, EAGE},
abstract = {The results of resistivity imaging survey of the chemical waste dumping site in Tarnowskie Gory are presented. Chemical wastes were stored in the area of the chemical plant and its surroundings for many years. Toxic elements migrated with surface water into the Quaternary and Triassic aquifers. The contaminated zone was determined using resistivity imaging survey with ABEM Lund Imaging System. The obtained resistivity cross sections clearly show the extent of the contaminated zones.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
The results of resistivity imaging survey of the chemical waste dumping site in Tarnowskie Gory are presented. Chemical wastes were stored in the area of the chemical plant and its surroundings for many years. Toxic elements migrated with surface water into the Quaternary and Triassic aquifers. The contaminated zone was determined using resistivity imaging survey with ABEM Lund Imaging System. The obtained resistivity cross sections clearly show the extent of the contaminated zones.
2002
Zuberek, W. M.; Żogała, B.; Rusin, M.; Pierwoła, J.; Wzientek, K.
In: Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea, vol. 27, no. 352, pp. 209-222, 2002, ISSN: 0138015X.
@article{2-s2.0-19244378130,
title = {Geophysics applied to study the areas degraded by the military activity [Badania geoelektryczne i magnetyczne na obszarach zdegradowanych działalnościa wojskowa]},
author = { W.M. Zuberek and B. Żogała and M. Rusin and J. Pierwoła and K. Wzientek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-19244378130&partnerID=40&md5=8edf40f826007f0bac09210702b0351d},
issn = {0138015X},
year = {2002},
date = {2002-01-01},
journal = {Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea},
volume = {27},
number = {352},
pages = {209-222},
abstract = {The paper contains summary of research on heavy degraded and polluted area of one of the former Soviet military fuel bases in Borne Sulinowo (Poland). The base area is about 17 ha. In the past it was there 423 underground fuel containers connected with pipelines. Now the installation is extracted. In this area pollution refers to soils, surface, subsurface and groundwater. The reason of study was to test different geophysical methods: geoelectrical, electromagnetical and magnetical ones for surveys on contaminated ground. The maximum depth of survey was approximately 15 m. Several anomalies have been detected and it is possible to point out their sources. The anomalies create distinct zones, which can be related to the places where the former fuel containers were installed. They could be connected with oil contamination and products of its disintegration. The results indicate that several metal and ferro - concrete objects are still under the surface. Obtained findings show that the geophysical prospecting methods can be used for location and monitoring of areas degraded by military activity. In particular it concerns the former military firing grounds.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The paper contains summary of research on heavy degraded and polluted area of one of the former Soviet military fuel bases in Borne Sulinowo (Poland). The base area is about 17 ha. In the past it was there 423 underground fuel containers connected with pipelines. Now the installation is extracted. In this area pollution refers to soils, surface, subsurface and groundwater. The reason of study was to test different geophysical methods: geoelectrical, electromagnetical and magnetical ones for surveys on contaminated ground. The maximum depth of survey was approximately 15 m. Several anomalies have been detected and it is possible to point out their sources. The anomalies create distinct zones, which can be related to the places where the former fuel containers were installed. They could be connected with oil contamination and products of its disintegration. The results indicate that several metal and ferro - concrete objects are still under the surface. Obtained findings show that the geophysical prospecting methods can be used for location and monitoring of areas degraded by military activity. In particular it concerns the former military firing grounds.
Markowski, E.; Kornowski, J.; Zuberek, W. M.
In: Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea, vol. 24, no. 340, pp. 263-276, 2002, ISSN: 0138015X.
@article{2-s2.0-12244294772,
title = {Measurements with some analysis of mining induced seismic events recorded on the surface of the Bytom Coal Co. region [Pomiary i analiza wyników rejestrowanych na powierzchni wstrza̧sów indukowanych eksploatacja̧ górnicza̧ w obszarze bytomskiej spółki wȩglowej S.A.]},
author = { E. Markowski and J. Kornowski and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-12244294772&partnerID=40&md5=35adeea996982dce0f005d82d7df4ba7},
issn = {0138015X},
year = {2002},
date = {2002-01-01},
journal = {Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea},
volume = {24},
number = {340},
pages = {263-276},
publisher = {Polish Academy of Sciences},
abstract = {After a few years of seismic monitoring on the surface of the Bytom Coal Co. (BSW S.A.) region, some conclusions on the seismograms, their spectra measurements and amplitudes can be formulated. On the average, amplitudes are attenuated with distance, as expected, and higher frequencies are attenuated faster, but relations are highly variable and sensitive to local conditions. About 99% of wave field energy (measured as integrated squared particle velocity) occurs below 20 Hz, so if we are interested in seismic energies only, a sampling frequency of 60 Hz seems to be adequate; however, for nearby sources, significant acceleration amplitudes above 20 Hz are observed and if they are of interest, a sampling frequency above 100 Hz is advised. From the whole set of observations, events of energy 2 105 J have been selected and maximum acceleration amplitude versus distance relations have been analysed. In the observed epicentral distance range (400-2000 m) the maximum acceleration amplitude decrease can be described by linear relation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
After a few years of seismic monitoring on the surface of the Bytom Coal Co. (BSW S.A.) region, some conclusions on the seismograms, their spectra measurements and amplitudes can be formulated. On the average, amplitudes are attenuated with distance, as expected, and higher frequencies are attenuated faster, but relations are highly variable and sensitive to local conditions. About 99% of wave field energy (measured as integrated squared particle velocity) occurs below 20 Hz, so if we are interested in seismic energies only, a sampling frequency of 60 Hz seems to be adequate; however, for nearby sources, significant acceleration amplitudes above 20 Hz are observed and if they are of interest, a sampling frequency above 100 Hz is advised. From the whole set of observations, events of energy 2 105 J have been selected and maximum acceleration amplitude versus distance relations have been analysed. In the observed epicentral distance range (400-2000 m) the maximum acceleration amplitude decrease can be described by linear relation.
1997
Zuberek, W. M.; Teper, L.; Idziak, A. F.; Sagan, G.
Seismicity and tectonics in the Upper Silesian Coal Basin, Poland Journal Article
In: Prace - Panstwowego Instytutu Geologicznego, no. 157 PART 2, pp. 205-207, 1997, ISSN: 08669465, (4).
@article{2-s2.0-27844467244,
title = {Seismicity and tectonics in the Upper Silesian Coal Basin, Poland},
author = { W.M. Zuberek and L. Teper and A.F. Idziak and G. Sagan},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27844467244&partnerID=40&md5=fe41c6f656dab62efc3fd4407a0551e7},
issn = {08669465},
year = {1997},
date = {1997-01-01},
journal = {Prace - Panstwowego Instytutu Geologicznego},
number = {157 PART 2},
pages = {205-207},
abstract = {[No abstract available]},
note = {4},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
[No abstract available]
1996
Zuberek, W. M.; Żogała, B.
Memory of maximum stresses and maximum temperatures during rock deformation Journal Article
In: Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea, vol. 18, no. 273, pp. 132-137, 1996, ISSN: 0138015X.
@article{2-s2.0-5844302010,
title = {Memory of maximum stresses and maximum temperatures during rock deformation},
author = { W.M. Zuberek and B. Żogała},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-5844302010&partnerID=40&md5=c176ffb889c01fd22707569c7f888723},
issn = {0138015X},
year = {1996},
date = {1996-01-01},
journal = {Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea},
volume = {18},
number = {273},
pages = {132-137},
abstract = {The acoustic emission method has been widely used in the study of dynamic processes of rocks. In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The acoustic emission method has been widely used in the study of dynamic processes of rocks. In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.
Zuberek, W. M.; Żogała, B.
Memory of maximum stresses and maximum temperatures during rock deformation Journal Article
In: Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea, no. 18, pp. 135-138, 1996, ISSN: 0138015X.
@article{2-s2.0-27644567892,
title = {Memory of maximum stresses and maximum temperatures during rock deformation},
author = { W.M. Zuberek and B. Żogała},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27644567892&partnerID=40&md5=29c19014cbfee787c390948edc62e300},
issn = {0138015X},
year = {1996},
date = {1996-01-01},
journal = {Publications of the Institute of Geophysics, Polish Academy of Sciences, Series M: Miscellanea},
number = {18},
pages = {135-138},
abstract = {The acoustic emission method has been widely used in the study of dynamic processes of rocks. In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The acoustic emission method has been widely used in the study of dynamic processes of rocks. In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.
Zuberek, W. M.; Żogała, B.
Memory of maximum stresses and maximum temperatures during rock deformation Journal Article
In: Publications - Institute of Geophysics, Polish Academy of Sciences, series M, vol. M-18, no. 273, pp. 133-138, 1996.
@article{2-s2.0-0030480022,
title = {Memory of maximum stresses and maximum temperatures during rock deformation},
author = { W.M. Zuberek and B. Żogała},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030480022&partnerID=40&md5=742f9d9153ab000d4aeea0af3f42c74c},
year = {1996},
date = {1996-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, series M},
volume = {M-18},
number = {273},
pages = {133-138},
abstract = {In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In Poland, laboratory investigations on the effect of acoustic emission related to both mechanical and thermal loading, and the effect of memory of maximum stress and maximum temperature have been carried out. The latest results are briefly discussed in this paper.
Sagan, G.; Teper, L.; Zuberek, W. M.
Tectonic analysis of mine tremor mechanisms from the upper Silesian Coal Basin Journal Article
In: Pure and Applied Geophysics, vol. 147, no. 2, pp. 217-238, 1996, ISSN: 00334553, (8).
@article{2-s2.0-0342855099,
title = {Tectonic analysis of mine tremor mechanisms from the upper Silesian Coal Basin},
author = { G. Sagan and L. Teper and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0342855099&doi=10.1007%2fbf00877479&partnerID=40&md5=3106cc24c1574b2d08620592e752c766},
doi = {10.1007/bf00877479},
issn = {00334553},
year = {1996},
date = {1996-01-01},
journal = {Pure and Applied Geophysics},
volume = {147},
number = {2},
pages = {217-238},
publisher = {Birkhauser Verlag AG},
abstract = {Fault network of the Upper Silesian Coal Basin (USCB) is built of sets of strike-slip, oblique-slip and dip-slip faults. It is a typical product of force couple which acts evenly with the parallel of latitude, causing horizontal and anti-clockwise movement of rock-mass. Earlier research of focal mechanisms of mine tremors, using a standard fault plane solution, has shown that some events are related to tectonic directions in main structural units of the USCB. An attempt was undertaken to analyze the records of mine tremors from the period 1992-1994 in the selected coal fields. The digital records of about 200 mine tremors with energy larger than 1 × 104 J (ML > 1.23) were analyzed with SMT software for seismic moment tensor inversion. The decomposition of seismic moment tensor of mine tremors was segmented into isotropic (I) part, compensated linear vector dipole (CLVD) part and double-couple (DC) part. The DC part is prevalent (up to 70%) in the majority of quakes from the central region of the USCB. A group of mine tremors with large I element (up to 50%) can also be observed. The spatial orientation of the fault and auxiliary planes were obtained from the computations for the seismic moment DC part. Study of the DC part of the seismic moment tensor made it possible for us to separate the group of events which might be acknowledged to have their origin in unstable energy release on surfaces of faults forming a regional structural pattern. The possible influence of the Cainozoic tectonic history of the USCB on the recent shape of stress field is discussed.},
note = {8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fault network of the Upper Silesian Coal Basin (USCB) is built of sets of strike-slip, oblique-slip and dip-slip faults. It is a typical product of force couple which acts evenly with the parallel of latitude, causing horizontal and anti-clockwise movement of rock-mass. Earlier research of focal mechanisms of mine tremors, using a standard fault plane solution, has shown that some events are related to tectonic directions in main structural units of the USCB. An attempt was undertaken to analyze the records of mine tremors from the period 1992-1994 in the selected coal fields. The digital records of about 200 mine tremors with energy larger than 1 × 104 J (ML > 1.23) were analyzed with SMT software for seismic moment tensor inversion. The decomposition of seismic moment tensor of mine tremors was segmented into isotropic (I) part, compensated linear vector dipole (CLVD) part and double-couple (DC) part. The DC part is prevalent (up to 70%) in the majority of quakes from the central region of the USCB. A group of mine tremors with large I element (up to 50%) can also be observed. The spatial orientation of the fault and auxiliary planes were obtained from the computations for the seismic moment DC part. Study of the DC part of the seismic moment tensor made it possible for us to separate the group of events which might be acknowledged to have their origin in unstable energy release on surfaces of faults forming a regional structural pattern. The possible influence of the Cainozoic tectonic history of the USCB on the recent shape of stress field is discussed.
1995
Żogała, B.; Zuberek, W. M.; Dubiel, R.
In: Publications - Institute of Geophysics, Polish Academy of Sciences, series, M, no. M-19(281), pp. 245-254, 1995, (2).
@article{2-s2.0-0029535438,
title = {Studies of the maximum temperature memory effect decay during seismoacoustic emission in sedimentary rocks [Badania nad zanikaniem efektu pamieci maksymalnej temperatury w przebiegu emisji sejsmoakustycznej w skalach osadowych]},
author = { B. Żogała and W.M. Zuberek and R. Dubiel},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029535438&partnerID=40&md5=48d3de0379f6d8cd1413e6699d983838},
year = {1995},
date = {1995-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, series, M},
number = {M-19(281)},
pages = {245-254},
abstract = {Under thermal stress, rocks undergo microfracturing, fracturing and finally fail. These processes are connected with acoustic emission. It was found that some sedimentary rocks subject to cyclical heating exhibit the effect of memory of the maximum temperature from the preceding cycle. Several tests of this effect on Carbonbiferous mudstone have been carried out. Samples were heated cyclically, in each cycle to a temperature higher than in the previous cycle. It was clearly found that acoustic emission exists and the discrete maximum temperature memory effect from the previous cycle is evident. This paper determines the influence of the heating rate on the acoustic emission level and on the value of the thermal memory coefficient (felicity ratio) which is the measure of maximum temperature memory decay. The first results suggest that the heating rate has a large influence on the acoustic emission level and thermal memory coefficient. -English summary},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Under thermal stress, rocks undergo microfracturing, fracturing and finally fail. These processes are connected with acoustic emission. It was found that some sedimentary rocks subject to cyclical heating exhibit the effect of memory of the maximum temperature from the preceding cycle. Several tests of this effect on Carbonbiferous mudstone have been carried out. Samples were heated cyclically, in each cycle to a temperature higher than in the previous cycle. It was clearly found that acoustic emission exists and the discrete maximum temperature memory effect from the previous cycle is evident. This paper determines the influence of the heating rate on the acoustic emission level and on the value of the thermal memory coefficient (felicity ratio) which is the measure of maximum temperature memory decay. The first results suggest that the heating rate has a large influence on the acoustic emission level and thermal memory coefficient. -English summary
Sagan, G.; Dubiel, R.; Mitrega, P.; Zuberek, W. M.
In: Publications - Institute of Geophysics, Polish Academy of Sciences, series M, no. M-19(281), pp. 33-45, 1995, (2).
@article{2-s2.0-0029471951,
title = {The mechanism of mining tremors related to damages observed in the stope area [Mechanizm wstrzasow gorniczych w swietle obserwacji ich skutkow w wyrobiskach]},
author = { G. Sagan and R. Dubiel and P. Mitrega and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029471951&partnerID=40&md5=f4b84406fcdb8caccc6ad9ebeb001bef},
year = {1995},
date = {1995-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, series M},
number = {M-19(281)},
pages = {33-45},
abstract = {Six mining tremors (connected with rockbursts) from the Wujek coal mine area, with energies 105-107 J, were chosen for investigation. All events caused serious and well documented damage in mining excavations and were felt on the Earth's surface. The mechanisms of these tremors were determined on the basis of digital recordings from the mining seismological network using the seismic moment tensor inversion method for P-wave first arrivals. The number of analysed events was small but it appears that tremors connected with coal rockbursts have a smaller isotropic to deviatoric ratio of the seismic moment tensor compared to mining tremors without damages observed underground. -from English summary},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Six mining tremors (connected with rockbursts) from the Wujek coal mine area, with energies 105-107 J, were chosen for investigation. All events caused serious and well documented damage in mining excavations and were felt on the Earth's surface. The mechanisms of these tremors were determined on the basis of digital recordings from the mining seismological network using the seismic moment tensor inversion method for P-wave first arrivals. The number of analysed events was small but it appears that tremors connected with coal rockbursts have a smaller isotropic to deviatoric ratio of the seismic moment tensor compared to mining tremors without damages observed underground. -from English summary
1992
Sagan, G.; Zuberek, W. M.
In: Publications - Institute of Geophysics, Polish Academy of Sciences, Series M, no. M-16(245), pp. 157-175, 1992, (2).
@article{2-s2.0-0027097295,
title = {Geological aspects of induced seismicity in the central area of the Upper Silesian Coal Basin [Geologiczne aspekty sejsmicznosci indukowanej w centralnym obszarze Gornoslaskiego Zaglebia Weglowego]},
author = { G. Sagan and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027097295&partnerID=40&md5=9cc6b31d2d76117d5060a23a0c86dfd6},
year = {1992},
date = {1992-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, Series M},
number = {M-16(245)},
pages = {157-175},
abstract = {Based on the catalogue of shocks from three seismic regions of the Upper Silesian Coal Basin, an analysis was made of the relation between seismicity and mining. The character of the relation was found to vary from region to region. Mechanisms of 83 shocks from mining regions of mines Wujek and Szombierki were determined on the basis of spatial orientation of nodal planes, under the assumption that the rupture mechanism in the focus is the shear mechanism. Some indications have been found as to possible relations between the rupture mechanism and tectonic regime in the youngest phases of Alpine orogenesis in the Upper Silesian Basin. -English summary},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Based on the catalogue of shocks from three seismic regions of the Upper Silesian Coal Basin, an analysis was made of the relation between seismicity and mining. The character of the relation was found to vary from region to region. Mechanisms of 83 shocks from mining regions of mines Wujek and Szombierki were determined on the basis of spatial orientation of nodal planes, under the assumption that the rupture mechanism in the focus is the shear mechanism. Some indications have been found as to possible relations between the rupture mechanism and tectonic regime in the youngest phases of Alpine orogenesis in the Upper Silesian Basin. -English summary
Żogała, B.; Zuberek, W. M.
In: Publications - Institute of Geophysics, Polish Academy of Sciences, Series M, no. M-16(245), pp. 217-227, 1992, (2).
@article{2-s2.0-0027068584,
title = {Changes in seismoacoustic emission in carboniferous rocks subject to thermal stresses [Zmiany emisji sejsmoakustycznej w probkach skal karbonskich poddanych naprezeniom termicznym]},
author = { B. Żogała and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027068584&partnerID=40&md5=993542cc7067967ae0a0f89d0dfb695d},
year = {1992},
date = {1992-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, Series M},
number = {M-16(245)},
pages = {217-227},
abstract = {Measurements of seismoacoustic emission have been performed on Carboniferous mudstone and sandstone samples subjected to five heating cycles. Each cycle was terminated at temperatures higher than the preceding one. The measurements confirmed the occurrence of seismoacoustic emission, which rapidly increases when a certain temperature value is exceeded. The range of temperatures at which seismoacoustic emission appears in the studied rock samples was determined. The results suggest the occurrence of discrete memory of the maximum temperature of the former cycle. -English summary},
note = {2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Measurements of seismoacoustic emission have been performed on Carboniferous mudstone and sandstone samples subjected to five heating cycles. Each cycle was terminated at temperatures higher than the preceding one. The measurements confirmed the occurrence of seismoacoustic emission, which rapidly increases when a certain temperature value is exceeded. The range of temperatures at which seismoacoustic emission appears in the studied rock samples was determined. The results suggest the occurrence of discrete memory of the maximum temperature of the former cycle. -English summary
Chodyn, L.; Zuberek, W. M.
Effect of the discrete stress memory in the acoustic emission in soils Journal Article
In: Acta Geophysica Polonica, vol. 40, no. 2, pp. 139-158, 1992, ISSN: 00015725, (4).
@article{2-s2.0-0027045234,
title = {Effect of the discrete stress memory in the acoustic emission in soils},
author = { L. Chodyn and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027045234&partnerID=40&md5=c77ede3f69b2d1ac4b4478a875464c0e},
issn = {00015725},
year = {1992},
date = {1992-01-01},
journal = {Acta Geophysica Polonica},
volume = {40},
number = {2},
pages = {139-158},
abstract = {Physical fundamentals of the effect of the discrete maximum stress memory in soils in the course of acoustic emission (AE) are not quite clear. Laboratory tests were carried out on the soils with different granular content from fine sands to fine gravels. The samples were triaxially compressed in several cycles increasing the differential stress and measuring the axial strain and AE rate (count number per time unit). The conclusions were checked during pressiometric tests "in situ' in the sand pit. It has been found that there exist the practical possibility of the use of the maximum stress memory effect in the course of AE for the solution of some geotechnical tasks for example, for the estimation of the preconsolidation pressure of the soil. -from Authors},
note = {4},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Physical fundamentals of the effect of the discrete maximum stress memory in soils in the course of acoustic emission (AE) are not quite clear. Laboratory tests were carried out on the soils with different granular content from fine sands to fine gravels. The samples were triaxially compressed in several cycles increasing the differential stress and measuring the axial strain and AE rate (count number per time unit). The conclusions were checked during pressiometric tests "in situ' in the sand pit. It has been found that there exist the practical possibility of the use of the maximum stress memory effect in the course of AE for the solution of some geotechnical tasks for example, for the estimation of the preconsolidation pressure of the soil. -from Authors
1986
Sagan, G.; Zuberek, W. M.
In: Publications - Institute of Geophysics, Polish Academy of Sciences, Series M, no. M-8(191), pp. 217-239, 1986, (1).
@article{2-s2.0-0022825858,
title = {(Analysis of relation between seismicity, tectonics and mining works in the Polkowice copper mine, Poland). [Analiza zwiazku sejsmicznosci z tektonika i przebiegiem eksploatacji w obszarze gorniczym kopalni 'Polkowice'.]},
author = { G. Sagan and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0022825858&partnerID=40&md5=524dad966216a81a270f83b633b1ea21},
year = {1986},
date = {1986-01-01},
journal = {Publications - Institute of Geophysics, Polish Academy of Sciences, Series M},
number = {M-8(191)},
pages = {217-239},
abstract = {The results suggest that seismic activity in the Polkowice mine depends on 3 main factors: the mine-out area in a given region of the deposit, the tectonic engagement and the depth of mining.-from English summary},
note = {1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results suggest that seismic activity in the Polkowice mine depends on 3 main factors: the mine-out area in a given region of the deposit, the tectonic engagement and the depth of mining.-from English summary
1985
Zuberek, W. M.
Energy Transformation During Crack Growth in Rocks. [PRZEMIANA ENERGII W PROCESIE WZROSTU PEKNIECIA W SKALACH.] Journal Article
In: Acta Montana, no. 71, pp. 17-32, 1985, ISSN: 03651398.
@article{2-s2.0-0022177039,
title = {Energy Transformation During Crack Growth in Rocks. [PRZEMIANA ENERGII W PROCESIE WZROSTU PEKNIECIA W SKALACH.]},
author = { W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0022177039&partnerID=40&md5=825eb5a995fe01a6503131afc9a43935},
issn = {03651398},
year = {1985},
date = {1985-01-01},
journal = {Acta Montana},
number = {71},
pages = {17-32},
abstract = {The paper deals with the transformation of potential energy to kinetic energy during the crack growth process starting from the energy balance equation. The kinetic energy is a direct source of the emitted elastic waves. It is shown that during the crack growth, the released energy is dissipated and its excess is transformed into kinetic energy. The kinetic energy increase during the crack growth determines the division of cracks into brittle, semi-brittle, or ductile ones. The velocity of crack growth can therefore be assumed as a criterion of this crack division. It is included that, in the case of a brittle rock fracture, elastic waves with high amplitudes are generated. With the increase of crack growth ductility, the amplitude of emitted waves is significantly lower.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The paper deals with the transformation of potential energy to kinetic energy during the crack growth process starting from the energy balance equation. The kinetic energy is a direct source of the emitted elastic waves. It is shown that during the crack growth, the released energy is dissipated and its excess is transformed into kinetic energy. The kinetic energy increase during the crack growth determines the division of cracks into brittle, semi-brittle, or ductile ones. The velocity of crack growth can therefore be assumed as a criterion of this crack division. It is included that, in the case of a brittle rock fracture, elastic waves with high amplitudes are generated. With the increase of crack growth ductility, the amplitude of emitted waves is significantly lower.
1983
Zuberek, W. M.
In: Acta Geophysica Polonica, vol. 31, no. 4, pp. 343-354, 1983, ISSN: 00015725.
@article{2-s2.0-0020869056,
title = {Probabilistic interpretation of the frequency- energy distribution of seismic activity and of the amplitude distribution of seismoacoustic activity ( Poland).},
author = { W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0020869056&partnerID=40&md5=1729b98daa5f32ead3f20f8c582cd457},
issn = {00015725},
year = {1983},
date = {1983-01-01},
journal = {Acta Geophysica Polonica},
volume = {31},
number = {4},
pages = {343-354},
abstract = {Tries to explain the frequency-energy distribution of seimsic activity and the amplitude distribution of seismoacoustic activity using the extreme value theory. A good accordance of the energy distribution of mining tremors recorded in the Upper Silesian Coal Basin in the period of 1977-1980 with the second asymptotic distribution of maximum values was found. The estimation of the distribution parameters allows to calculate the probability of tremor occurrence in the range of high seismic energies.-Author},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tries to explain the frequency-energy distribution of seimsic activity and the amplitude distribution of seismoacoustic activity using the extreme value theory. A good accordance of the energy distribution of mining tremors recorded in the Upper Silesian Coal Basin in the period of 1977-1980 with the second asymptotic distribution of maximum values was found. The estimation of the distribution parameters allows to calculate the probability of tremor occurrence in the range of high seismic energies.-Author
1979
Kornowski, J.; Trombik, M.; Zuberek, W. M.
In: Wybrane zagadnienia geofizycznych badan w kopalniach, Swierklaniec 1976, pp. 181-197, 1979.
@article{2-s2.0-0018666913,
title = {(Results of microseismic source location at the ' Szombierki' coal mine). [Wyniki lokalizacji ognisk impulsow sejsmoakustycznych w kopalni wegla kamiennego 'Szombierki'.]},
author = { J. Kornowski and M. Trombik and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0018666913&partnerID=40&md5=c9f9c45e89aaba60c50acc672c6c75a0},
year = {1979},
date = {1979-01-01},
journal = {Wybrane zagadnienia geofizycznych badan w kopalniach, Swierklaniec 1976},
pages = {181-197},
publisher = {Publications-Institute of Geophysics, P.A.N. , M-2, no 123},
abstract = {Results of research on the possibility of determining fracture zones of the rock mass, particularly in seams liable to rock bursts, with the use microseismic source location technique are presented. A network of geophones was installed ahead of a working face and the microseismic activity initiated by blastings was recorded on a multichannel tape recorder. Reading off the time differences of first arrivals on consecutive channels with an accuracy of 0.2 ms, and determining the P-wave velocity in the area, the source co-ordinates of a number of impulses were calculated. The measuring method and detailed results are described. The location error was verified in practive, and for sharp arrivals it was no greater than 10m. The analysis of results indicates the fracturing of the rock mass ahead of the longwall face, mainly in the coal seam and in the firect roof rocks. Taking into account the possibility of attaining such a location accuracy, we may expect to be able to apply this method to determining the rock mass fracturing zones in coal seams liable to coal bumps; its practical use, however, seems to be conditioned by automation of labour-consuming interpretation of the records.-English summary},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of research on the possibility of determining fracture zones of the rock mass, particularly in seams liable to rock bursts, with the use microseismic source location technique are presented. A network of geophones was installed ahead of a working face and the microseismic activity initiated by blastings was recorded on a multichannel tape recorder. Reading off the time differences of first arrivals on consecutive channels with an accuracy of 0.2 ms, and determining the P-wave velocity in the area, the source co-ordinates of a number of impulses were calculated. The measuring method and detailed results are described. The location error was verified in practive, and for sharp arrivals it was no greater than 10m. The analysis of results indicates the fracturing of the rock mass ahead of the longwall face, mainly in the coal seam and in the firect roof rocks. Taking into account the possibility of attaining such a location accuracy, we may expect to be able to apply this method to determining the rock mass fracturing zones in coal seams liable to coal bumps; its practical use, however, seems to be conditioned by automation of labour-consuming interpretation of the records.-English summary
1978
Kornowski, J.; Trombik, M.; Zuberek, W. M.
Locating Zones of Concentration of Seismoacoustic Pulse Centers. [LOKALIZACJA STREF KONCENTRACJI OGNISK IMPULSOW SEJSMOAKUSTYCZNYCH.] Journal Article
In: Przegl Gorn, vol. 33, no. 2, pp. 72-79, 1978.
@article{2-s2.0-0017936239,
title = {Locating Zones of Concentration of Seismoacoustic Pulse Centers. [LOKALIZACJA STREF KONCENTRACJI OGNISK IMPULSOW SEJSMOAKUSTYCZNYCH.]},
author = { J. Kornowski and M. Trombik and W.M. Zuberek},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0017936239&partnerID=40&md5=c4bf732da4d488573820394a7784a373},
year = {1978},
date = {1978-01-01},
journal = {Przegl Gorn},
volume = {33},
number = {2},
pages = {72-79},
abstract = {The results of tests on the locating of seismoacoustic pulse centers in a coal seam being worked are presented. A network of 4 to 6 geophones installed ahead of the working face at distances of 40 to 100 m apart was used. Using controlled blasting the P wave velocity was determined in the observed area. The locating of the pulse centers was carried out on the basis of differences in the pulse arrival times at successive sensors and on the basis of the known wave propagation velocity. In the case of sharp pulse arrivals the location error is less than 10 m. Seismoacoustic pulse center distributions obtained after two concussion blastings are presented.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of tests on the locating of seismoacoustic pulse centers in a coal seam being worked are presented. A network of 4 to 6 geophones installed ahead of the working face at distances of 40 to 100 m apart was used. Using controlled blasting the P wave velocity was determined in the observed area. The locating of the pulse centers was carried out on the basis of differences in the pulse arrival times at successive sensors and on the basis of the known wave propagation velocity. In the case of sharp pulse arrivals the location error is less than 10 m. Seismoacoustic pulse center distributions obtained after two concussion blastings are presented.