贵州发耳煤矿二次回采切顶卸压机制及矿压演化规律

doi:10.13722/j.cnki.jrme.2022.1206

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Abstract In order to effectively study the stability of mining face and roadway surrounding rock during the secondary mining period，to ensure that there will be no safety hazards in the whole process of secondary mining，and to ensure the perfect and reasonable on-site support scheme，based on the geological condition of the 50305 working face of Fa?er coal mine，the deformation of roadway surrounding rock and mining face stress during secondary mining face of 50305 working face are analyzed systematically，so as to use reasonable support measures. Through theoretical analysis，the mechanical fracture criterion of secondary mining roadway roof is studied，and the scope of the failure zone is determined in advance. Through the numerical simulation，the mining face stress during the working face mining is analyzed in detail，and the roadway stress and displacement are analyzed in detail，which provides a reference for the use of reasonable advance support measures during the secondary mining to ensure safe mining. Through the field analysis，the surface displacement and deformation of roadway and hydraulic support load during secondary mining are analyzed，and the field application effect and whether there are shortcomings are observed to provide reference for other mines. The secondary mining roadway is supported with constant resistance anchor cable，U-section steel and temporary support，and the secondary mining effect of self-formed roadway without coal pillar is good.

Key words： mining engineering roof cutting and pressure relief secondary mining mine pressure law surrounding rock control

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	Articles by authors
	YANG Xiaojie1
	2
	CHENG Manjiang1
	2
	WANG Jiong1
	2
	ZHANG Wenjie1
	2

Cite this article:

YANG Xiaojie1,2,CHENG Manjiang1, et al. Pressure relief mechanism of roof cutting of Fa?er coal mine in Guizhou and the evolution law of ground pressure during secondary mining[J]. , 2023, 42(10): 2358-2371.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1206 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I10/2358

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