含弧形裂隙岩体的裂纹扩展模拟研究

Simulation Study of Crack Propagation in Rock Mass with Arc Cracks

为研究弧形裂隙对裂隙岩体的力学性能和裂纹扩展的影响,选取FLAC3D软件中应变软化模型和空模型来模拟岩石裂隙扩展情况,将塑性区视为反应裂隙扩展的依据,研究单轴压缩荷载下裂隙拱高、裂隙弦长及裂隙倾角等对弧形裂隙扩展规律及力学特性的影响。模拟结果表明试件峰值强度随着拱高的增加而降低,且裂隙弦长对峰值强度也有影响。裂隙倾角影响着弧形裂隙的扩展路径,当倾角变大时,试件峰值强度也随之增加。最后采用模型试验对模拟结果进行初步验证。

To investigate the effect of arc cracks on mechanical properties and crack propagation of fractured rock mass,the strain softening model and the null model in FLAC3D software are adopted respectively to describe the mechanical behavior of the rock and crack,and the plastic zone is regarded as the basis for crack propagation.This numerical calculation model is adopted to study the effect of arch height,chord length and inclination on the crack propagation path and rock mass mechanical behavior under uniaxial compression.The calculation results are as follows:the peak strength of the sample decreases as the arch height increases,and the chord length also affects the peak strength.The crack inclination has an effect on the expansion path of arc cracks.The peak strength of the sample increases when the inclination becomes larger.Finally,the model test is used to verify the rationality of the simulation results.