两侧不规则采空区孤岛工作面煤体整体冲击失稳研究

doi:10.13722/j.cnki.jrme.2014.0960

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Abstract To research the risk of coal overall instability of isolated working face with irregular gobs on both sides，the isolated working face 3206 of a mine in Shandong as the engineering background was studied，and the dynamic process of roof structure in irregular gobs on both sides during the period of mining working face was analyzed in this paper. Based on the technique of microseismic monitoring with high accuracy，the amount of overburden movement angle and gangue contacting angle over the gobs was got. Meanwhile，the calculative formula of bearing pressure on isolated working face of coal and the analytic method of its instability was proposed. The results showed that stress would reach a maximum when the hanging roof structure turned to the semi-hanging roof structure over gobs，while stress would reduce when the width of gobs was large enough which indicated the gobs had came into a full-mining level. Moreover，the instability coefficient in various stages was obtained during the mining based on the geological conditions of the working face 3206. The analysis results showed that: the instability would occur quite possibly when the working face was in the process of mining. However，it could be mined safely by taking the method of drilling relief with large diameter to prevent the occurrence of rock burst. Ultimately，the correctness of this paper has been confirmed by the mining practice.

Key words： mining engineering isolated working face gob width instability coefficient microseismic monitoring drilling relief with large diameter

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	JIANG Fuxing
	CHENG Gong
	FENG Yu
	WANG Cunwen
	XU Yongyong

Cite this article:

JIANG Fuxing,CHENG Gong,FENG Yu, et al. RESEARCH ON COAL OVERALL INSTABILITY OF ISOLATED WORKING FACE WITH IRREGULAR GOBS ON BOTH SIDES[J]. , 2015, 34(S2): 4164-4170.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0960 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4164

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