不同真三轴应力路径下钻孔煤体的力学特性及气体流动规律

doi:10.13722/j.cnki.jrme.2022.1087

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Abstract To study the mechanical properties and gas flow laws during the progressive failure of the drilled coal，the multi-functional true triaxial fluid-solid coupling test system was used to carry out true triaxial tests. The strength and failure characteristics，and permeability evolution laws of the drilled coal under different true triaxial stress paths were obtained. The results show that：(1) There are differences in the drilled coal strength for different borehole directions，among which the strength perpendicular to the bedding plane direction is the largest，followed by the strength perpendicular to the butt cleat direction，and the smallest perpendicular to face cleat direction. Both the linear Mogi-Coulomb strength criterion and the Nadai strength criterion are well fitted with the strength data of the drilled coal under different true triaxial stress paths. The Nadai strength criterion has a better fitting effect when the pre-existing cleats are obvious. (2) The permeability of the drilled coal at different deformation stages，when subjected to the true triaxial loading stress path perpendicular to cleat directions，is significantly smaller than that measured under the true triaxial loading-unloading stress paths. (3) When perpendicular to the bedding plane，the macro-fractures around the borehole are mainly tension fractures. When perpendicular to the butt cleat，there are two types of shear and tension macro-fractures generated around the borehole. When perpendicular to the face cleat，the macro-fractures around the borehole were mainly shear cracks. Besides，the number of macro-fractures，especially those accompanied by macro-fractures for drilled coal tested under the stress path of increasing maximum principal stress and decreasing intermediate and minimum principal stresses increased significantly.

Key words： mining engineering true triaxial test drilled coal mechanical properties gas flow bedding plane

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	Articles by authors
	LIU Yubing1
	2
	WANG Enyuan1
	2
	ZHAO Dong1
	2
	ZHANG Li1
	2

Cite this article:

LIU Yubing1,2,WANG Enyuan1, et al. Mechanical characteristics and gas flow laws of drilled coal under different true triaxial stress paths[J]. , 2023, 42(8): 1878-1889.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1087 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I8/1878

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