裂隙岩体宏细观剪切损伤力学行为研究

doi:10.13722/j.cnki.jrme.2022.0152

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Abstract The laboratory direct shear test and PFC2D microscopic simulation were used to investigate the shear deformation，strength characteristics and damage evolution law of fractured rocks. The research results show that：(1) The shear strength-deformation curve of fractured rocks can be divided into four stages：compaction stage，approximate linear elastic stage，unstable development stage and residual deformation stage. (2) The peak shear deformation of fractured rocks is negatively correlated with the number of fractures(N)，the normal stress( ) and the shear rate(ν). And the peak shear stress of fractured rocks is negatively correlated with N and ν，while positively correlated with . Besides，the greater N is，the more obvious the effect of ν on the peak shear deformation is，and the greater ν is，the more significant the effect of N on peak shear deformation is. (3) With increasing the shear deformation，the number of meso-damage cracks(shear cracks and tensile cracks) increases with the variation characteristics of slight (Ⅰ) →steep (Ⅱ) →slow (Ⅲ). The frictional dissipation energy gradually increases，the elastic strain energy first increases and then decreases. Especially，the elastic strain energy of rock mass only accounts for 1/5～2/5 of the total energy of mesoscopic damage. (4) At the tip of the preset cracks，the micro-meso cracks initiate，expand and then penetrate. In the end，the central rock bridge is mainly damaged by tensile，and the failure modes of two sides shows shear(tensile) failure- tensile-shear failure- shear failure. The peak shear stress (displacement) is X-type＞M2＞round-hole＞Z-type. The damage cracks appear at the tip of pre-existing flaw，and also the top or bottom left of the hole. The distribution of cracks is basically the same for the X-type and M2 fractured rocks.

Key words： rock mechanics fractured rocks direct shear test PFC2D numerical simulation failure mode damage mechanical behavior

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	Articles by authors
	CHEN Xin1
	ZHOU Xiaohan1
	2
	3
	XU Bin1
	2
	3
	LIU Xinrong1
	2
	3
	GUO Xueyan1
	WANG Jiwen1
	ZENG Xi1

Cite this article:

CHEN Xin1,ZHOU Xiaohan1,2, et al. Investigation on the macro-meso shear damage mechanical behaviors of fractured rocks[J]. , 2022, 41(12): 2509-2521.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0152 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I12/2509

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