Impact of destress blasting on stress field development ahead of a hardcoal longwall face

0429479 - ÚGN 2015 RIV GB eng C - Conference Paper (international conference)
Koníček, Petr - Ptáček, Jiří - Staš, Lubomír - Kukutsch, Radovan - Waclawik, Petr - Mazaira, Alejandro
Impact of destress blasting on stress field development ahead of a hardcoal longwall face.
EUROCK 2014 - Rock Engineering and Rock Mechanics: Structures in and on Rock Masses. London: CRC Press, Taylor and Francis Group, Balkema, 2014 - (Alejano, L.; Perucho, Á.; Olalla, C.; Jiménez, R.), s. 585-590. ISBN 978-1-315-74952-5.
[EUROCK 2014 - Rock Engineering and Rock Mechanics: Structures in and on Rock Masses. Vigo (ES), 26.05.2014-28.05.2014]
R&D Projects: GA MV VG20102014034
Institutional support: RVO:68145535
Keywords : destress blasting * mining * hardcoal longwall
Subject RIV: DH - Mining, incl. Coal Mining
http://www.isrm.net/conferencias/detalhes.php?id=3119&show=conf

Stress concentration and rockburst risk in coal mine are associated with the occurrence of competent strata in overburdened coal seams. Benches of sandstone and conglomerate are difficult unbreakable and a high level of elastic energy is stored there. It can be released as a rockburst. Destress blasting is a rockburst protective measure in hardcoal longwall mining. For optimal use of this method it is useful to know the stress changes induced by blasting. This paper describes the results of a project’s in situ stress and its changes measurement ahead of an advancing longwall face in rock mass affected by destress blasting. The project was carried out in a longwall panel with a high rockburst risk. The newly developed modified overcoring method of stress testing was used. Although the explored longwall is still in progress the first results of stress development in the overburden of a mined seam influenced by blasting are interpreted.
Permanent Link: http://hdl.handle.net/11104/0234598