基于裂隙倾角的非均质岩石单轴压缩数值模拟

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

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。

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 angleθon 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 ofθ,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”.