循环加卸载作用下完整和裂隙煤体渗透性演变规律研究

doi:10.13722/j.cnki.jrme.2021.0241

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Abstract In order to obtain the seepage characteristics of the protected layers under repeated mining，this paper summarizes the stress path of the protected layers as three stages of loading，unloading and recovery，and carries out simulating repeated mining seepage tests by a self-made gas injection and displacement gas tester to analyze the seepage law of two types of intact and fractured coal samples. The results show that the more the mining times，the more obvious the permeability changes，and the unloading stage is the main stage of permeability change. The stress sensitivity of two kinds of coal samples decreases along with increasing the mining times in the loading stage，while increases with increasing the mining times in unloading and recovery stages. The stress sensitivity of the intact coal samples under the first and second mining is greater than that of the fractured coal samples，while the stress sensitivity of the fractured coal samples under the third mining is greater than that of the intact coal samples. The first and second mining is the compaction stage of two types of coal samples，and the third mining is the permeability increasing stage. The permeability increasing effect of the third mining is greater than that of the first and second mining，and the permeability increasing effect of repeated mining on the fractured coal samples is greater than that of the intact coal samples.

Key words： rock mechanics coal seam group mining fracture structure stress sensitivity permeability damage rate gas extraction

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	Articles by authors
	ZHANG Lei1
	KAN Zihao1
	XUE Junhua2
	LI Mingxue3
	ZHANG Cun4

Cite this article:

ZHANG Lei1,KAN Zihao1,XUE Junhua2, et al. Study on permeability law of intact and fractured coals under cyclic loading and unloading[J]. , 2021, 40(12): 2487-2499.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0241 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I12/2487

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