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节理岩体具有不连续和大变形等特征。为研究节理岩体巷道围岩的稳定性,基于离散单元法的颗粒流程序,为设于节理岩体中(考虑其节理连通率为0,50%和70%的3种情况)的巷道建立模型,分析巷道围岩的变形以及微裂纹分布。结果表明,当巷道处于完整岩体时,巷道围岩变形较小;当围岩节理连通率达到50%时,巷道围岩出现局部脱落但没有明显的破坏面;当围岩节理连通率为70%时,巷道围岩容易形成破坏面,围岩出现块体状脱落,巷道围岩变形破坏严重。随着节理连通率的增加,围岩微裂纹急剧增加,围岩四周主要分布剪切裂纹,岩体巷道的破坏方式以剪切破坏为主。
The jointed rock mass is characterized by discontinuities and large deformations. In order to study the stability of the surrounding rock of the jointed rock mass, the particle flow program based on the discrete element method is used to establish the tunnel in the jointed rock mass (considering the three kinds of situations that the joint join rates are 0, 50% and 70%) Model to analyze the deformation of surrounding rock and the distribution of microcracks. The results show that when the roadway is in a complete rock mass, the deformation of the surrounding rock is small. When the join rate of surrounding rock reaches 50%, the surrounding rock of the roadway appears partially but no obvious failure surface. When the jointed rate of surrounding rock joints is 70 %, The surrounding rock of the roadway is easy to form the destructive surface, the surrounding rock appears block-like and the surrounding rock of the roadway deforms and destroys seriously. With the increase of joint rate, the microcracks of surrounding rock increase sharply, and the shear cracks distribute mainly around the surrounding rock. The failure mode of rock tunnel is dominated by shear failure.