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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Topical issues connected with necessity of improvement of mining hazards prevention
 Drzewiecki, J. ; Kabiesz, J. ; Przeczek, A. ; Koníček, Petr
Many mine induced seismic events are monitored in Upper Silesian Coal Basin both in Czech and Polish parts. In some cases these seismic events are attendet by rock bursts. Many broadly-based researches are carried out by Czech and Polish science institutions to explain the rockburst genesis. For all that we consider rockburst as hardly predictable mining risks. The contribution focuses on rockburst control solution. The examples of the stress-strain monitoring methods used by both Polish and Czech researchers are described together with some useful rock burst prevention methods. The high level of knowledge of the determinative parameters of the rockbursts occurrence help to create effective rockburst model. Anyway the research collaboration in the area of rock burst study improve the degree of mining safety.
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Evaluation of effectiveness of destress coal blasting fro stress release
 Koníček, Petr ; Przeczek, A.
Destress blasting in the coal seam are important active rockbursts measures in conditions of Czech part of the Upper Silesian Coal Basin. Destress coal blasting involves regularly setting off carefully tailored blasts in the fractured coal immediately ahead of a mining face, so as to encourage slip on pre-existing fractures, in order not to allow the accumulation of high strain energy density in the rock mass. In some cases high stress in coal seams (or surrounded rocks) can be reduced. In cases that we demands high stress release we evaluates effect of stress release. Evaluation of stress release is carried out the same procedure without difference between destress blasting in rock and in the coal seam. Paper describes the first analysis of destress blasting in coal seams realised in period 2008 – 2010 (source of seismological databases, about 1200 data). The result of analysis shows of necessity of separate system of stress release evaluation by destress blasting in coal seams and rocks.
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Strategy of longwall preparation and of the possibility of support strengthening in the coal mines with the rock burst risk
 Ptáček, Jiří ; Konečný, Petr ; Šňupárek, Richard ; Koníček, Petr
The contribution presents conclusions of the research project called Miners protection against rock burst in the gates and measures to avoid them after checking the rock burst danger, supported by Czech Mining Authority. The results of research on the reinforced break through support and research on the way and strategy of longwalls driving in the conditions of rock burst danger are described.
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