三轴应力加卸载作用下损伤煤岩渗透率模型研究

doi:10.13722/j.cnki.jrme.2021.0053

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Abstract In order to study changes in permeability of coal in the process of damage and failure under stress loading and unloading，based on coal“cube”structure model，a triaxial stress loading-unloading damage coal permeability model was established by comprehensively considering the deformation of coal cleats and matrix due to the actions of damage，effective stress and adsorption/desorption under triaxial stress loading-unloading，and the permeability model was verified based on the experimental results. The research results show that the established permeability model can not only better reflect the change law of the damaged coal permeability under the action of triaxial stress loading and unloading，but also reflect the phenomenon that the effective stress has far greater influence on coal permeability than adsorption/desorption. When the load on the coal is lower than the peak strength，the coal is in a compressed state under the constant confining pressure and continuous axial compressive loading，and the gas permeability decreases；while reducing the confining pressure and continuously increasing the axial pressure，damage begins to occur inside the coal，and the gas permeability increases slowly. As a result，the overall gas permeability of coal exhibits a“V”-shaped development trend before failure. The increase in the permeability of coal after failure increases with increasing the initial confining pressure，and the initial permeability of coal increases with increasing the gas pressure. The research results can provide theoretical support for the high-efficiency gas drainage and gas disaster prevention and control in my country¢s deep coal mining face，and have guiding significance.

Key words： mining engineering coal rock permeability model stress loading and unloading damage and failure fracture deformation

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	Articles by authors
	BAI Xin1
	2
	WANG Dengke2
	TIAN Fuchao3
	ZHANG Dongming4
	LI Haojun5
	REN Fake3

Cite this article:

BAI Xin1,2,WANG Dengke2, et al. Permeability model of damaged coal under triaxial stress loading-unloading[J]. , 2021, 40(8): 1536-1546.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0053 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1536

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