含非贯通节理花岗岩的力学特性与细观起裂机制研究

doi:10.13722/j.cnki.jrme.2022.0671

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Abstract The complex fracture initiation mechanism and failure mode of discontinuous joints are significant to the mechanical behavior of rock mass. Considering the effect of the joint angles and length，the influence of non-persistent joint on the mechanical properties and fracture characteristics of rock mass are analyzed with granite rock specimens under uniaxial loading. Then a three-dimensional discrete element model was established，and the failure mechanism and crack propagation were investigated from the meso-scale. Finally，a fracture mechanical model with a non-persistent joint is established to analyze the fracture toughness，and the influence of joint inclination and penetration on the brittle fracture resistance of rock mass is quantified. The results show that：the degradation effect of initial damage on rock mass is obvious. Six kinds of cracks are distinguished according to the experimental results and the crack initiation failure mode of joint samples has a significant influence on the strength characteristics. The fracture toughness of the specimen increases with the increase of joint inclination at the range of 15°‐75°，and the brittle fracture resistance of the specimen with 15° joint is the weakest. With the increase of joint persistency，the fracture toughness of jointed rock mass decreases in an approximate hyperbolic trend.

Key words： rock mechanics rock mechanics non-persistent joint fracture mechanics model fracture toughness

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	Articles by authors
	LIU Tingting1
	2
	YANG Runchao1
	DING Luyang1
	LI Xinping1
	2
	ZENG Lele1
	2

Cite this article:

LIU Tingting1,2,YANG Runchao1, et al. Study on mechanical properties and meso-initiation mechanism#br# of granite with non-persistent joints[J]. , 2023, 42(5): 1070-1082.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0671 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I5/1070

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