Ground surface uplift during hardcoal longwall mining

0556486 - ÚGN 2023 RIV GB eng J - Článek v odborném periodiku
Jiránková, Eva - Koníček, Petr
Ground surface uplift during hardcoal longwall mining.
International Journal of Rock Mechanics and Mining Sciences. Roč. 153, May 2022 (2022), č. článku 105099. ISSN 1365-1609. E-ISSN 1873-4545
GRANT EU: European Commission(XE) 899192 - PostMinQuake
Institucionální podpora: RVO:68145535
Klíčová slova: ground uplift * subsidence trough * longwall mining * induced seismicity * hardcoal
Obor OECD: Mining and mineral processing
Impakt faktor: 7.2, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S1365160922000673

Ground surface uplift was detected during longwall mining in the Lazy Mine, a hard coal mine in the Czech part of the Upper Silesian Coal Basin, Czech Republic. The greatest uplift was 218 mm, based on surface point levelling by comparing surface points with heights of non-mined areas. This uplift occurred during subcritical mining at an average depth of 740 m below the surface. The mined coal seam is situated below the previously mined part of the multi-seam deposit. This study aims to provide a geomechanical explanation for ground surface uplift observed during longwall mining. The source of surface uplifts were deep inside the rock mass, therefore, enabling only the examination of geological, geomechanical, seismic, and technical mining data for uplift occurrence analysis. Therefore, the spatiotemporal evaluation of the observed vertical displacement and induced seismicity data was processed, and the observed ground surface was compared with empirical subsidence. Two time periods with surface uplifts during longwall mining were evaluated. Thick, competent rock layers, together with specific geomechanical conditions, were identified as the main characteristics responsible for the uplift.
Trvalý link: http://hdl.handle.net/11104/0330707