基于复杂随机裂隙网络的隧洞围岩稳定性分析

为研究改进刚体弹簧法在复杂裂隙围岩分析中的适用性，以某隧道工程为例，开展了算例验证分析。首先根据实测裂隙地质资料，采用Monte-Carlo方法生成随机裂隙网络，并通过块体搜索方法获取岩石块体信息；然后利用改进刚体弹簧方法计算围岩在开挖卸荷作用下的位移和破坏模式，并评价支护效果。计算表明，改进刚体弹簧法可以有效模拟裂隙不利组合引起的开挖边墙滑动失稳，并能准确把握边墙的渐进破坏特性，符合一般工程实践的规律。

Analysis of tunnel excavation stability based on complex random fracture network model

For studying the adaptability of improved Rigid Block Spring Method in stability analysis of complex fracture rock, we conduct sample verification for a tunnel project. Firstly based on the geologic data of the fracture rock mass, the Monte-Carlo method is employed to generate random discrete fracture network and the block search method is adopted to obtain the block information. The improved Rigid Block Spring Method is used to analyze displacements and failure modes of surrounding rocks under excavation unloading, and to assess the effects of the supporting plan. The results indicate that the improved Rigid Block Spring Method could simulate the slipping failure caused by unfavorable fracture combination and accurately capture the progressive failure process of the side wall, which are in accordance with engineering practices.