Record details

Title
    Rockbursts provoked by destress blasting in hard coal longwall mining
Author
    Koníček, Petr
    Souček, Kamil
    Staš, Lubomír
Conference
    International Symposium on Rock Fragmentation by Blasting (26.11.2012-29.11.2012 : New Dehli, Indie)
Language
    anglicky
Publication type
    konferenční příspěvek (zahraniční konference)
Source title - monograph
    Rock Fragmentation by Blasting. Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting
Pages
    S. 193-202
Notes
    Autoři celkem: 3
    Projekt: VG20102014034, GA MV3cav_un_auth*0273815
    Rozsah: 10 s. : E
Subject category
    destress blasting
    mining industry
    rockburst hazard
Keyword
    Blasting
    Coal
    Destress
    Hard
    Longwall
    Mining
    Provoked
    Rockbursts
Abstract (in english)
   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.
Contributor
    AV ČR Brno, Ústav geoniky
Contributor code
    AV ČR, ÚG
Source format
    U
Import date
    24. 10. 2014