深厚表土运动诱发高应力煤柱频繁冲击机制及防控试验研究

doi:10.13722/j.cnki.jrme.2024.0195

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Abstract

Facing the escalating rock burst risks in Juye coalfield's main coal pillars，and grounded in the frequent impacts at Zhaolou Coal Mine?s seventh mining area，a combination of field measurements，numerical simulations，theoretical analysis and industrial experiments is employed to investigate the causes of frequent high-stress coal pillar impacts due to thick overburden movement，and a novel pressure fracturing method for high-stress isolated coal bodies to prevent rock bursts is introduced. PFC simulations reveal three loading modes as overburden thickness increases with mining field length，including uniform load，soil pressure arch and a combination of both. Stratum movement is divided into three stages such as bedrock fracture movement，initial rock-soil linkage and periodic rock-soil linkage. A quantification method for the fault coal pillar?s load distribution curve is developed，considering load transfer mechanisms under fault isolation and sequential overburden conditions. An engineering model for stress-bearing in isolated coal bodies is established，along with criteria for instability and impact in the main tunnel. The frequent impact mechanism of high-stress coal pillars is explained by the coupling effect of rock-soil strata linkage loading and fault isolation，leading to stress concentration in fault coal pillars. The proposed pressure fracturing method reduces the elastic core?s bearing capacity through hydraulic fracturing，promoting load redistribution and stress equalization for rock burst prevention. The water injection fracture pressure for the elastic core determined by industrial tests is approximately 30 MPa，with crack expansion and stress homogenization width exceeding 21.2 and 14.5 m. Monitoring and CT scan results indicate that elastic core fracturing reduces stress concentration，releases critical energy，and lowers the risk of impacts in isolated coal bodies.

Key words： mining engineering deep topsoil roadway coal pillar faults frequent shocks hydrofracture

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	Articles by authors
	ZHANG Xiang1
	ZHU Sitao1
	2
	ZHANG Xiufeng2
	WANG Chao3
	CHEN Yang2
	LI Shidong4
	KONG Zhen4
	ZHU Quanjie5
	YUAN Tengfei4

Cite this article:

ZHANG Xiang1,ZHU Sitao1,2, et al. Experimental study on mechanism and prevention of frequent impact of high stress coal pillars induced by deep topsoil movement[J]. , 2024, 43(10): 2552-2569.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0195 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2552

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