Title: Rock strata failure and subsidence characteristics under the mining of short distance thick coal seams: a case in west China

Authors: Jianghua Li; Hongjie Li; Ling Li; Donghao Wang

Addresses: China Coal Research Institute, Mine Safety Technology Branch, Beijing 100013, China; Coal Research Institute, State Key Laboratory of Coal Mining and Clean Utilisation, Beijing 100013, China ' China Coal Research Institute, Mine Safety Technology Branch, Beijing 100013, China; Coal Research Institute, State Key Laboratory of Coal Mining and Clean Utilisation, Beijing 100013, China ' China Coal Research Institute, Mine Safety Technology Branch, Beijing 100013, China; Coal Research Institute, State Key Laboratory of Coal Mining and Clean Utilisation, Beijing 100013, China ' China Coal Research Institute, Mine Safety Technology Branch, Beijing 100013, China; Coal Research Institute, State Key Laboratory of Coal Mining and Clean Utilisation, Beijing 100013, China

Abstract: For the western mines in China, it is very important to protect water resources and ecological environment, because of the lack of water. It is of prime importance for the research on the rock failure rule of short distance coal mining. Take the western mine as an example, water consumption and borehole TV observation methods were used to measure the failure of hard rock after the mining of short distance coal seams. Dynamic change progress of rock failure was researched through numerical simulation method. Surface movement and deformation rule for short distance mining was analysed by probability integral method. The research results indicated the closer the rock was to the goaf, the larger the fracture was. The deformation, movement and failure bands of surrounding rock were enlarged with the working face advance. The scope of influence for subsidence was smaller in the shallow area than in the deep area.

Keywords: rock failure; short-distance coal seams; high-strength mining; fractures characteristics of rock failure; mining subsidence; surface deformation; caving zone; fissure zone.

DOI: 10.1504/IJGEI.2021.10040099

International Journal of Global Energy Issues, 2021 Vol.43 No.4, pp.356 - 370

Received: 08 May 2020
Accepted: 28 Sep 2020

Published online: 12 Aug 2021 *

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