基于离散裂隙网络的岩体各向异性莫尔–库仑表征方法研究

doi:10.13722/j.cnki.jrme.2022.0627

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Abstract The spatial distribution and roughness characteristics of the structural planes have a significant impact on the anisotropic properties of jointed rock mass，which are important factors affecting the engineering stability. To study the influence of roughness on the mechanical properties of anisotropy of jointed rock mass，a rough joint network model was established based on the fractal theory. Numerical compression tests considering varied rotation angles and confining pressures were conducted. Comparison of failure modes and acoustic emission characteristics between the fractal fracture model and the linear fracture model were performed. The results show that significant differences exist consideing the joint roughness，comparing the mechanical behaviours，AE charateristics and size effect. Meanwhile，a quantitative analysis of the anisotropy of the compressive strength and shear strength parameters of the jointed rock mass was conducted. The anisotropic Mohr circles based on the least squares principle were discussed. The biaxial compressive strength and shear strength parameters of the jointed rock mass show slight anisotropy. Differences of peak stresses，Mohr circle shapes and shear properties were verified under different loading directions. Influence of the geometry of the discrete faractures on the strength and fracture patterns was verified. The results will provide a novel and scientific model for characterizing the fractured rock mass and give a good reference for analysing the anisotropic shear behaviours of jointed rock masses.

Key words： rock mechanics discrete fracture network fractal theory Mohr-Coulomb criterion anisotropy shear strength

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	Articles by authors
	WANG Peitao1
	2
	3
	LIU Cao1
	3
	MA Chi1
	3
	REN Fenhua1
	3
	CAI Meifeng1
	3

Cite this article:

WANG Peitao1,2,3, et al. On the anisotropic Mohr-Coulomb criterion of fractured rock masses based on the discrete fracture network[J]. , 2023, 42(S1): 3266-3280.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0627 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3266

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