The Instability Characteristics and Displacement Law of Coal Wall Containing Joint Fissures in the Fully Mechanized Working Face with Great Mining Height

Weibin Guo (), Yuhui Li and Gang Wang
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Weibin Guo: Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education, School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yuhui Li: Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education, School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Gang Wang: Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education, School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2022, vol. 15, issue 23, 1-22

Abstract: Coal wall rib-spalling is regarded as a key technical problem influencing safe and efficient mining of fully mechanized working face with great mining height (FGH) while the coal wall stability is influenced by the strength of the coal body, of which the internal joint fissures have a crucial impact on the strength of the coal body. This research attempted to explore how the coal wall stability of FGH is influenced by the occurrence of joint fissures. This paper uses physical and numerical simulations to systematically analyze the instability characteristics and displacement law of FGH. Research results show that the form and scope of the instability of coal wall rib-spalling depend on the state of the coal seam joint fissures development area, and the development state of coal seam joint fissures is related to the combination of the coal seam joints; under the condition of hard coal, the coal wall stability is better at the inclination angle of 90°, and less stable at 45° and 135°; under the condition of medium-hard coal and joint surface inclination angle of 45° and 135°, the smaller the spacing of joint surface, the larger the area of the working face rib-spalling, and the less stable the coal wall.

Keywords: coal wall stability; rib-spalling; joint fissures; physical simulation; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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