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Large scale destress blasting in roof rocks for rockburst control
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SYSNO ASEP 0497129 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Large scale destress blasting in roof rocks for rockburst control Author(s) Koníček, Petr (UGN-S) RID, ORCID Number of authors 1 Source Title Rock Dynamics - Experiments, Theories and Applications. - London : Taylor and Francis Group, 2018 / Li L. ; Zhang L. - ISBN 978-0-8153-9667-3 Pages s. 291-297 Number of pages 8 s. Publication form Print - P Action Rock Dynamics – Experiments, Theories and Applications Event date 26.06.2018 - 27.06.2018 VEvent location Trondheim Country NO - Norway Event type WRD Language eng - English Country GB - United Kingdom Keywords destress blasting ; induced seismicity ; rockburst ; stress release Subject RIV DH - Mining, incl. Coal Mining OECD category Mining and mineral processing R&D Projects LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UGN-S - RVO:68145535 Annotation The importance of using the destress blasting as an active rockburst mitigation measure has in-creased within the frame of present increase and development in mining depth and high horizontal stresses. The main goals of the destress blasting are softening of competent rock layers, reduction of strain energy stor-age and rock mass stress release, which together contribute to minimizing rockburst occurrence and risk. Case study of the destress blasting from Czech hardcoal mining in unfavorable geomechanical conditions is presented and evaluated in terms of rockburst prevention. Destress blasting stages were carried out in a group of boreholes (3–7) with the total explosive charge ranging from 1275 kg to 3075 kg, detonated regularly at a distance of 28 m to 52 m ahead of the advancing longwall face. Evaluation of destress blasting based on seismic monitoring revealed that the longwall blastings were very successful in terms of rock mass stress release and decrease the rockburst risk. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2019
Number of the records: 1