Rockbursts provoked by destress blasting in hard coal longwall mining

Destress blasting is a very important proactive measure in areas of rockburst hazard in many mining regions. However, among the hard coal mining industry in particular, it is still not a popular choice. Destress blasting is used as a standard proactive technique in areas of high rockburst risk in lo...

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Bibliographic Details
Published inRock Fragmentation by Blasting : The 10th International Symposium on Rock Fragmentation by Blasting, 2012 (Fragblast 10) pp. 193 - 202
Main Authors Konicek, P, Soucek, K, Stas, L, Przeczek, A
Format Conference Proceeding
LanguageEnglish
Published Leiden Taylor & Francis Books Ltd 01.01.2013
Subjects
Blasting
Boreholes
Coal mining
Energy storage
Explosives
Mines
Mining industry
Rocks
Stone
Stress concentration
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Summary:Destress blasting is a very important proactive measure in areas of rockburst hazard in many mining regions. However, among the hard coal mining industry in particular, it is still not a popular choice. Destress blasting is used as a standard proactive technique in areas of high rockburst risk in longwall mining in the Czech part of the Upper Silesian Coal Basin (UCSB). Destress blasting is carried out in rigid competent rocks adjacent to coal seams at depths of 700 to 1000 m below the surface. Groups of boreholes (from 2 to 10) are fired with explosive charges of 500 to 4500 kg during longwall mining of thick coal seams (thickness from 4 to 6 m) ahead of the longwall face. The main goals of destress blasting are the softening of the competent rock layers for better caving, reduction of strain energy storage and rock mass stress release. Induced rockburst can be provoked in favourable conditions and such cases from locations in the USCB are described in the paper.
ISBN:9780415621434
0415621437