Rock burst risk analysis and prevention in rotary working face under influence of sharp corner coal pillar

doi:10.16265/j.cnki.issn1003-3033.2020.08.023

Abstract

Abstract: In order to prevent rock burst disaster of working face under complex conditions, with working face featuring coupling of sharp corner coal pillar and rotary mining as research background, influencing factors of rock burst were analyzed from aspects of burst proneness, geological structure, in-suit stress, hard roof, rotary mining and sharp corner pillars. Then, mining stress evolution characteristics in working face were studied based on numerical simulation. Finally, dangerous areas and degree were obtained and prevention measures were put forward accordingly. The results indicate that continuous sharp corner coal pillars have higher stress concentration condition and generate stress accumulation effect. Dangerous areas are mainly before and during working face rotation. Transportation roadway has strong rock burst risk due to impact of fault, boundary coal pillar and rotary mining while tail entry has it due to that of sharp corner pillar and rotary mining. Rock burst can be prevented in rotary mining area and sharp corner coal pillar respectively through reducing mining intensity and reliving pressure statically.

Key words: sharp corner coal pillar, rotary working face, rock burst, mining stress, control technique

CLC Number:

X936

LYU Pengfei, ZHANG Xianrong, QIU Lin, CHEN Guangbo, WANG Eryu. Rock burst risk analysis and prevention in rotary working face under influence of sharp corner coal pillar[J]. China Safety Science Journal, 2020, 30(8): 158-163.

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