采动覆岩裂隙与渗流分形演化规律及工程应用

doi:10.13722/j.cnki.jrme.2022.0128

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Abstract During the mining process of high gassy coal seam，the fracture and permeability evolution law of mining overburden rock has a control effect on the pressure relief gas migration and partition enrichment. Therefore，how to quantitatively and accurately describe the fracture development and permeability distribution characteristics of mining overburden rock is the key to improve the gas drainage efficiency of goaf and fracture zone. Based on the engineering background of Pingshu Coal Mine in the Yangquan Mining Area，this paper simulates the movement and deformation of overlying strata and the dynamic evolution law of fractures during the mining process of the working face. The fractal geometry theory is introduced to quantitatively describe the generation and development process of mining-induced overburden fractures，and then the fractal permeability model of fractured rock mass is derived. The fine characterization of the dominant channel of gas migration and the non-uniform distribution of permeability in overburden fractures is realized. The research shows that，with the continuous advancement of the working face，the overburden fissures develop forward and upward，and the overall development of the overlying fissures is a“double-peak”distribution pattern of high development on both sides of the goaf and compaction in the middle. The distinguishing dimension of vertical fractures on both sides of goaf reaches 1.143 and 1.151 respectively，which is obviously larger than that of other areas. It is the fully developed area of mining fracture and the dominant channel of pressure relief gas migration. According to the fractal permeability model of fractured rock mass，the permeability of the collapse zone is calculated to be 1×10－5–4×10－5 m2，and the permeability of the fracture zone is 8.9×10－9–9.8×10－7m2. The permeability distribution in the overlying fissure zone has an obvious zoning phenomenon，generally showing a“saddle-shaped”feature with high sides and low middle. The high permeability area is mainly concentrated in the goaf near the working face side(length 0–30 m along the strike) and the goaf near the incision side(length 110–150 m along the strike). The upper limit of the vertical high permeability area can reach 35 m above the coal seam. Based on this，the technical parameters of the high and low-level drainage tunnels in the experimental working face are put forward and applied，and good gas drainage effects of pressure relief in the goaf and fracture zone have been obtained. This research has important reference value to promote the application of the evolution law of overburden fissures and seepage from theory to practice.

Key words： mining engineering mining overburden fissure development percolation evolution fractal features permeability model

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	XU Chao1
	2
	3
	WANG Kai1
	2
	GUO Lin2
	YUAN Liang1
	3
	LI Xiaomin2
	ZHAO Chunyu2
	GUO Haijun1
	2
	SHU Longyong4

Cite this article:

XU Chao1,2,3, et al. Fractal evolution law of overlying rock fracture and seepage caused by mining and its engineering application[J]. , 2022, 41(12): 2389-2403.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0128 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I12/2389

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