高应力巷(隧)道围岩破坏过程分析

Analysis on Failure Process of Surrounding Rock of Roadway or Tunnel in High Stress Area

运用岩石破裂过程分析系统RFPA对3种不同围岩情况下的高应力巷(隧)道围岩破裂演化过程进行了数值模拟,并对模拟结果做了对比分析。数值模拟结果表明,围岩特性对其破坏过程影响很大;围岩破坏是在围岩卸荷条件下其损伤随时间逐步发展的渐进破坏过程,对于较均质和均质围岩,首先表现为较长阶段的损伤缓慢递增或无变化,随后进入短暂的加速破裂阶段和宏观破坏阶段,脆性破坏明显,对于低均质度围岩,一直表现为较长阶段的损伤递增变化,加速破裂阶段不明显;考虑施工扰动对围岩的影响,随围岩径向半径的增大,采用不同均质度和强度参数的围岩来模拟,模拟结果与实际情况相符。

The numerical simulation of failure evolution processes of surrounding rock of roadways or tunnel in high stress area under three conditions of surrounding rock were carried out by using a rock failure process analysis code （RFPA） , and the results of numerical simulation were analyzed. The results of numerical simulation indicated that the characteristic of surrounding rock has great influence on its failure process, the failure process of surrounding rock of roadway under unloading condition develops gradually with time;for more homogeneous and homogeneous rock, the damage process of surrounding rock appears a slow transformation or does not change in a long phases at first, then enter into a transitorily accelerated failure process and macroscopic failure phase, obviously exhibits brittle fracture;for inhomogeneous rock, the damage process of surrounding rock appears a progressive transformation in a longer phase, accelerated failure process is not obvious. Considering the impact of excavating disturbance on the surrounding rock, with the increasing of the radius of surrounding rock, roadway was simulated based on the different conditions of surrounding rock with different strength parameters and different homogeneity, simulated results were is in agreement with practical situation.