类岩材料多裂隙体在单轴压缩下的数值模拟

应用岩石破裂过程分析系统(RFPA2D)软件,考虑岩石的非均匀性,对含不同裂隙倾角和分布密度的试件在单轴压缩下的破坏模式进行研究,探索了不同裂隙倾角和分布密度对多裂隙类岩石材料断裂破坏模式的影响规律.数值分析与实验结果基本一致,试样破坏是一个由渐变到突变的过程,总体破坏过程可大致分为弹性变形阶段、裂纹萌生和稳定扩展阶段、裂纹不稳定扩展至失稳阶段3个阶段;声发射事件也可对应分为线性阶段、增长阶段、突变阶段3个阶段.对比不同试件组发现,含多预制裂隙体的裂纹贯通方式和整体破坏方式由裂隙倾角起主导影响作用;裂隙分布密度对裂隙体整体破坏形式的影响因裂隙倾角的差异而有所不同.

Numerical simulation on rock-similar material with multi-fractures under uniaxial compression

Considering the heterogeneity of rock,the study of the specimens with multi-fractures under uniaxial compression has been made by RFPA2D software.It was aimed to explore the influence of different angle and density of fractures on the failure mechanisms which belong to the rock-like materials with multi-fractures.Numerical analysis is consistent with the experimental results.The study shows that the overall failure process is a gradual-sudden change,which can be divided into 3 phases:elastic deformation stage,crack initiation and stable expansion stage,and crack unstable extended to failure stage.The AE events also can be divided into 3 phases:linear stage,growth stage,and mutation stage.Comparing different sample groups,it is found that the fracture angle is the most important influence on failure patterns;at the same time,the impact of fracture density is different due to the fracture angles.