节理岩体裂隙扩展过程一种新改进的弹脆性模拟方法及应用

AN IMPROVED ELASTIC-BRITTLE SIMULATION METHOD OF CRACK PROPAGATION PROCESS IN JOINTED ROCK MASS AND ITS APPLICATION

通过改进原有的FLAC3D本构关系为弹脆性本构,并采用超细单元划分法,模拟和研究双裂隙岩石试件在单轴、双轴加载作用下的破坏过程。数值计算结果与前人试验所得到的相应结果具有良好的一致性。用此方法还模拟了4条2组不同倾向裂隙的破裂过程和椭圆形三维单裂隙的扩展过程,且三维数值模拟结果与前人试验也有很好一致性。最后,将该模型引入到某边坡开挖工程的裂隙扩展过程研究和稳定性分析中,取得较好效果。

By improving the original constitutive relation of FLAC3D to the elastic-brittle model, as well as using superfine elements division, the failure process of the double-cracked rock specimen under uniaxial and biaxial compression are simulated and studied. The numerical results match well with the testing results obtained by early studies. This method is also used to simulate the failure process of rocks that contain four cracks （in two groups） of different inclinations or a single 3D crack; meanwhile, the numerical results of 3D crack propagation also match well with the testing results obtained by early studies. Finally, the model is applied to studying the crack propagation process and stability of a slope project; and it has a good effect.