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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摘要结构面的空间分布及几何粗糙度对岩体的各向异性力学特性影响显著，是影响工程稳定性的重要因素。通过建立粗糙裂隙网络数值模型，分别开展不同加载角度、不同双轴围压下的节理岩体数值试验研究，分析不同尺寸、几何类型条件下岩体的破坏模式和声发射特性；基于最小二乘原理分析各向异性莫尔圆分布特征。结果表明：粗糙节理网络模型与直线型节理网络模型在破坏模式、声发射模拟、尺寸效应方面均表现出显著的差异性，节理岩体抗压强度、抗剪强度参数呈现出的一定的各向异性，不同加载方向条件下，节理岩体的峰值强度、莫尔圆形态与抗剪指标均呈现显著变化，节理几何形态对岩体的强度和破坏模式影响显著。研究结果对岩体的各向异性抗剪力学特性的分析具有重要参考价值。

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	王培涛1
	2
	3
	刘操1
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	马驰1
	3
	任奋华1
	3
	蔡美峰1
	3

关键词 ：岩石力学, 离散裂隙网络, 分形, 莫尔&ndash, 库仑准则, 各向异性, 抗剪强度

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

引用本文:

王培涛1，2，3，刘操1，3，马驰1，3，任奋华1，3，蔡美峰1，3. 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[J]. 岩石力学与工程学报, 2023, 42(S1): 3266-3280.
WANG Peitao1，2，3，LIU Cao1，3，MA Chi1，3，REN Fenhua1，3，CAI Meifeng1，3. On the anisotropic Mohr-Coulomb criterion of fractured rock masses based on the discrete fracture network. , 2023, 42(S1): 3266-3280.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0627 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3266

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