极不稳定岩层巷道围岩支护参数优化设计研究

摘要

针对目前极不稳定岩层巷道支护参数设计不合理导致的支护失效问题,采用数值模拟软件FLAC,结合某矿山巷道实际情况进行了多方案的数值分析试验.对模拟结果进行计算分析,得到了巷道的最优支护方案,并应用到现场实践.实践表明,掘支之后的10～35 d,两帮变形速度较大,变形量一般可达到0.2～0.3 m;而经60d左右变形速度会趋于稳定.该方案完全可以保证巷道在服务期内的生产要求.%In order to solve the design problem of the support parameters of the extremely instable rock roadway,the numerical analysis test of multi scheme was carried out by using the numerical simulation software FLAC,combined with the actual situation of a mine tunnel.Calculation and analysis of the simulation results,the optimal roadway supporting scheme was obtained,and applied to the practice,the practice showed that after the excavation of 10 ～ 35 days,two for larger deformation and deformation velocity,which can reach 0.2 ～ 0.3 m;and after about 60 days after the deformation speed will tend to be stable.The scheme can guarantee the production requirements of the roadway during the service period.