节理岩体巷道的稳定性分析

Analysis of roadway stability injointed rock masses

由于节理、断层等不连续面的存在造成岩体变形的不连续性,并且这些不连续面对岩体变形、应力等力学行为造成重要影响。对已有的非连续变形分析程序进行了两点改进,分别在程序中加入了锚杆的塑性模拟和改进的SSOR-PCG方法,并且通过与试验数据的对比验证了改进程序的正确性。分析了某节理岩体巷道围岩的破坏过程,得到在原来支护方式的基础上在顶拱应力集中的位置增加3根锚索的支护方式对巷道的支护效果较好。最后通过对巷道关键点位移的监测优化了支护参数,得到锚杆长度为3 m,施加预应力为120 kN为支护的最优方式。

The mechanical behaviors of the jointed rock masses of the roadway were simulated using discontinuous deformation analysis （DDA）. Two improvements were developed, which respectively the anchor plastic simulation and improved SSOR-PCG method were implemented into the original DDA program and the advanced program was justified through the comparison with experimental data. Then, the process of damage of the surrounding rocks of the roadway was simulated using the advanced program and supporting method was optimized. At the last, the displacement monitor results of the key points were studied and applied to investigate the optimal support pattern of the roadway, which showed the anchor length with 3 m and the prestressing with 120 kN was the optimal support method.