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为获得张开型裂纹起裂及扩展规律,对于断裂力学分析不同裂纹倾角和不同裂纹长度时张开型裂纹的起裂特征,运用RFPA数值模拟软件研究含张开裂纹的岩体在单轴压缩试验下的裂纹扩展及破裂特点.研究结果表明:裂纹倾角和长度对张开型裂纹起裂及扩展规律的影响显著.裂纹倾角越大、长度越小,翼型裂纹扩展路径越趋于直线,起裂方向与原裂纹方向越接近,裂纹起裂角越小;裂纹起裂应力随裂纹倾角的增大先减小后增大,且与裂纹长度成反比.岩体的峰值强度也与裂纹几何参数密切相关,随裂纹倾角的增大呈现先减后增的变化规律,随裂纹长度的增加整体趋于减小.
In order to obtain the crack initiation and propagation laws of open crack, the crack initiation characteristics of open crack with different crack dip angles and different crack lengths were analyzed by using fracture mechanics. The RFPA numerical simulation software was used to study the crack initiation behavior of uniaxial compression The experimental results show that the crack angle and length have a significant influence on the initiation and propagation of open cracks.The larger the crack angle and the smaller the length of the crack, the more the airfoil crack propagates along the straight line, The closer the crack initiation direction is to the direction of the original crack, the smaller the cracking initiation angle is. The crack initiation stress decreases first and then increases with the increase of the crack dip angle, and it is inversely proportional to the crack length. The peak intensity of the rock mass is also related to the crack geometry The parameters are closely related to each other. With the increase of crack dip angle, the change rule of decreasing firstly and then increasing is as follows. As the crack length increases, the overall trend tends to decrease.