Geophysics in Mining and Environmental Protection

Idziak, Adam; Dubiel, R.

doi:10.1007/978-3-642-19097-1

Cited by 7 publications

(7 citation statements)

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“…Sykes 1967;Backus and Mulcahy 1976), was next transferred to calculate focal mechanisms of mine tremors (e.g. Gibowicz et al 1977;Hasegawa et al 1989;Gibowicz 1989;Dubiński et al 1996;Stec 2007;Gibowicz 2009;Lizurek and Wiejacz 2011). The basic assumption of this method is that the displacements at the far-field are a sum of displacements due to each of the force couples (Aki and Richards 1980) acting in the source, thus the seismic moment tensor defines the force system occurring in seismic point source.…”

Section: Seismic Moment Tensor Inversion Methodsmentioning

confidence: 99%

“…Domination of the double couple mechanism of forces (DC) indicates the sliding along the failure plane. It is the most used description of the mechanism of mine tremors (Gibowicz et al 1977;Gibowicz 1989;Stec 2007;Lizurek and Wiejacz 2011;Wojtecki et al 2016a). Some attempts were made applying the SMT inversion method for the tremors provoked by blasting in mines, which were published in a PhD dissertation (Król 1998) and after in works by Wojtecki et al (2013), Caputa et al (2015), and Wojtecki et al (2016a).…”

Section: Seismic Moment Tensor Inversion Methodsmentioning

confidence: 99%

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Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

Wojtecki

Koníček

Mendecki

et al. 2019

Pure Appl. Geophys.

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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.

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Section: Seismic Moment Tensor Inversion Methodsmentioning

confidence: 99%

Section: Seismic Moment Tensor Inversion Methodsmentioning

confidence: 99%

Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

Wojtecki

Koníček

Mendecki

et al. 2019

Pure Appl. Geophys.

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“…being a result of explosion or implosion, fluid injection, volcanic eruption etc.). The seismic moment tensor inversion method due to its flexibility, was successfully adapted to study mining-induced seismic events with complicated mechanism [11][12][13][14][15][16][17][18][19][20][21].…”

Section: Seismic Moment Tensor Inversion Methodsmentioning

confidence: 99%

Edges of overlying seams as a factor responsible for strong mining tremors occurrence during underground hard coal extraction in the light of seismic moment tensor inversion method

2019

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Physical processes occurring in the focus of tremor can be identified by solving a focal mechanism via the seismic moment tensor inversion method. In this article the estimation of focal mechanisms of strong mining tremors (according to Polish law tremors of energy higher or equal 1·105 J), which occurred during longwall mining of coal seam no. 507 in one of the hard coal mines in the Polish part of Upper Silesian Coal Basin was performed. Totally 7 strong mining tremors with the local magnitude from 1.84 to 2.52 were analysed. The most probable geomechanical processes in the foci of these tremors have been reconstructed. An attempt to determine the correlation between the edges of overlying seams no. 502, 504 or 506 and strong mining tremors occurrence has been made. The strike of determined nodal planes is in accordance with the azimuth of mentioned edges. The difference between them (absolute value) varies from 0.3° to 34.1° (on average approximately 19°).

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“…The application of different function types to describe the deformation process was proposed by Bogusz and Mendecki (2011) to find the time of the maximum subsidence velocity and, subsequently, to compare it with the position of a longwall front and the seismic activity (4):…”

Section: Modelling Of Displacement Velocitymentioning

confidence: 99%

Relation between benchmark displacement velocity and seismic activity caused by underground longwall exploitation

Duda

2015

Acta Geod Geophys

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The following paper addresses the problem of mining-induced surface subsidence by giving consideration to the aspect of displacement velocity and its relation to seismic activities recorded in the area of benchmarks. A series of geodetic measurements were carried out in order to develop an accurate description of the deformation process. The mathematical model of a benchmark displacement process was worked out to estimate the maximum deformation velocity and the time of maximum velocity occurrence. The comparison between the measured and calculated data was presented. The displacement velocity value was compared to the seismic activity recorded during the exploitation period. Four cases were thoroughly investigated as they represent types of relation between the seismic activity and the deformation velocity.

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Geophysics in Mining and Environmental Protection

Cited by 7 publications

References 0 publications

Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

Edges of overlying seams as a factor responsible for strong mining tremors occurrence during underground hard coal extraction in the light of seismic moment tensor inversion method

Relation between benchmark displacement velocity and seismic activity caused by underground longwall exploitation

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