Destress rock blasting as a rockburst control technique

0367791 - ÚGN 2012 RIV GB eng C - Conference Paper (international conference)
Koníček, Petr - Konečný, Petr - Ptáček, Jiří
Destress rock blasting as a rockburst control technique.
Harmonising Rock Engineering and the Environment. London: CRC Press Taylor and Francis Group, Balkema, 2011 - (Qian, Q.; Zhou, Y.), s. 1-6. ISBN 978-0-415-80444-8.
[International Congress on Rock Mechanics/12./. Beijing (CN), 18.10.2011-21.10.2011]
Institutional research plan: CEZ:AV0Z30860518
Keywords : underground coal mining * rock burst * destress rock blasting
Subject RIV: DH - Mining, incl. Coal Mining

Rockburst is a very dangerous phenomenon in mining. Destress blasting is one of the active methods of rockburst control. The effect of destress blasting is manifested in two ways: (i) it relieves stress in the forefield of the longwall face due to failure of the coal seam immediately ahead of the face and thus moves the surcharge zone further ahead of the face (preconditioning); and (ii) it influences the mechanical properties of adjacent rocks (softening the rock, reducing its effective elastic modulus, etc.). Due to these measures the high stress concentrations in coal seams (or accompanying rocks) can be reduced. The method of destress blasting is well known from ore mines where it was first used (deep South African gold mines in the 1950s). Application of this method is not yet widespread in hard coal mining. The experience of using the destress blasting technique in coal mines is presented in this paper, namely in difficult natural and mining conditions of multiseam hardcoal deposit (the Czech part of the Upper Silesian Coal Basin).
Permanent Link: http://hdl.handle.net/11104/0202343