层状岩体中隧道稳定性数值分析
Numerical simulation analysis of tunnel in layered rock-mass

对层理板岩进行不同加载角度的巴西劈裂试验,获得不同层理方向板岩试件计算抗拉强度。通过FLAC3D数值模拟巴西劈裂试验标定了板岩层理构造的强度参数,并用于层状岩体中隧道稳定性数值计算。通过数值模型对不同层理方向层状岩体中隧道稳定性、围岩松动区范围及失稳关键部位进行分析,对深入理解层状岩层中隧道失稳机理以及合理加固与监控量测等工程应用具有重要理论及实践意义。
In order to investigate the influence of rock transverse anisotropy on failure behavior,several groups of Brazilian split tests on slate with influence of different bedding angles were conducted. The calculated tensile strength of slate under different bedding angles were obtained. Numerical Brazilian test model was set up by FLAC3D to obtain strength parameters of bedding structure and these parameters were adopted in numerical simulation of tunnel excavation in layered rock mass. The stability, disturbed zone and failure position of tunnel in layered rock mass were analyzed by groups of numerical simulations. The study reveals the failure mechanism of tunnel excavation in layered rock mass, and can be meaningful for the reinforcement and monitoring of tunnel