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基于对岩石长期强度特征的认识,从岩石的强度、弹模等物理力学性质受环境影响随时间劣化以及岩石内部细观损伤积累的角度出发,通过引入岩体细观表征单元体的强度退化方程,应用RFPA数值分析方法,模拟了节理分布对巷道围岩的损伤演化和时效破坏机制的影响。在节理的影响下,巷道开挖后,围岩的应力分布规律发生明显的改变;节理为水平节理,巷道以两侧边墙片帮破坏为主;随着节理面倾角的变化,巷道围岩的时效损伤破坏模式也发生了明显的变化,巷道破坏区随节理倾角的增大相应旋转;当节理方向竖直时,巷道破坏主要集中于拱顶和拱底部位,出现了严重的冒顶和底鼓现象。同时,巷道周围围岩的位移也发生明显的变化,并且随着节理倾角的增大,巷道位移呈现出先增后减的大致趋势。
Based on the understanding of the characteristics of rock’s long-term strength, from the point of view of rock strength, physical and mechanical properties such as elastic modulus, deterioration with time and meso-damage accumulation in rock, the intensity degeneration equation , The influence of joint distribution on the damage evolution and aging failure mechanism of surrounding rock of roadway is simulated by RFPA numerical analysis method. Under the influence of joints, the stress distribution of surrounding rock changed obviously after the roadway was excavated. The joints were horizontal joints, and the roadway was dominated by the failure of the sidewalls on both sides. With the change of joint inclination, The damage mode of the damage also changed obviously. The failure area of the roadway revolved with the increase of the joint inclination. When the joint direction was vertical, the roadway destruction mainly concentrated on the vault and arch bottom, Drum phenomenon. At the same time, the displacements of surrounding rock around the roadway also change obviously. And with the increase of the inclination angle of the roadway, the roadway displacement presents the general trend of first increasing and then decreasing.