Numerical Simulation of Uniaxial Compression of Heterogeneous Rock Based on Fracture Crack Inclination Angle

doi:10.3969/j.issn.1674-0696.2024.10.05

Abstract

Abstract: Based on the particle flow computational framework, the Weibull distribution was employed to construct a heterogeneous numerical model of rock mechanics with a single pre-fabricated crack, and uniaxial compression tests of heterogeneous rock was simulated. The influence of the pre-fabricated crack inclination angle θ on the stress-strain response characteristics, microcrack behavior and failure mode of rock numerical specimens was analyzed. The results indicate that the peak strength (σpeak) increases with the increase of the homogeneity of rock (m) and finally tends to be stable. However, due to the influence of θ, σpeak shows a small drop, with a maximum value of 7 MPa. The failure surface of numerical samples of heterogeneous rocks is mainly composed of microscopic tensile cracks. The macroscopic failure modes of heterogeneous rocks can be divided into “inverse diagonal type”, “semi-dual type”, “coupling type” and “diagonal type”.

Key words: tunnel engineering; rock mechanics; Weibull distribution; failure mode; pre-fabricated crack; uniaxial compression; heterogeneity

摘要： 基于颗粒流计算框架，采用Weibull分布构建含单预制裂纹非均质岩石的力学数值模型，模拟了非均质岩石的单轴压缩试验；分析了预制裂隙倾角θ对岩石数值试样应力-应变响应特征、微裂纹行为及破坏模式的影响。结果表明：非均质岩石的峰值强度σpeak随着岩石均质度m的增大而增大，最终趋于稳定；受预制裂隙倾角θ影响，σpeak有小幅度跌落，最大达7 MPa；非均质岩石数值试样破坏面主要由微观拉伸裂纹组成；非均质岩石宏观破坏模式可分为“逆对角型”“半对偶型”“对耦型”及“顺对角型”4种。

关键词: 隧道工程；岩石力学； Weibull分布；破坏模式；预制裂纹；单轴压缩；非均质

CLC Number:

U452
TU45

MA Bin1, ZHU Jinyang2, WANG Jiajun2, JIANG Xuehui2,3, GUO Haosen2. Numerical Simulation of Uniaxial Compression of Heterogeneous Rock Based on Fracture Crack Inclination Angle[J]. Journal of Chongqing Jiaotong University(Natural Science), 2024, 43(10): 39-46.

马斌1，朱金养2，王加俊2，江学辉2，3，郭浩森2. 基于裂隙倾角的非均质岩石单轴压缩数值模拟[J]. 重庆交通大学学报（自然科学版）, 2024, 43(10): 39-46.

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