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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 rock burst process analysis system (RFPA) was used to simulate the rupture process of surrounding rock in high stressed alluvial tunnel under three different surrounding rock conditions. The simulation results were compared and analyzed. The numerical simulation results show that the characteristics of surrounding rock have a great influence on the failure process. Surrounding rock failure is a gradual failure process of the damage progressing with time in the unloading condition of surrounding rock. For more homogeneous and homogeneous surrounding rock, firstly, The damage slowly increases or no change for the longer period, and then enters the transient accelerating and rupturing stage and the macroscopical damage stage. The brittle failure is obvious. For the low-homogenizing surrounding rock, the damage of the long-term stage has been shown to be increasing gradually and the stage of accelerating rupture Which is not obvious. Considering the influence of construction disturbance on the surrounding rock, the surrounding rock with different parameters of homogeneous degree and strength is simulated with the increase of radial radius of surrounding rock. The simulation results are consistent with the actual situation.