裂隙岩体中渗流作用对隧道围岩稳定性的影响分析

隧道穿越节理裂隙发育地质环境时，水压力以及节理裂隙发育程度会对开挖后围岩的稳定性产生影响。以某隧道为工程背景，运用离散元理论，考虑流固耦合作用，分析了水位高度和节理法向刚度对隧道开挖后洞周位移收敛、围岩剪应力及塑性区、支护结构受力的影响。计算结果表明:在一定范围内，水位高度和节理法向刚度越大，围岩塑性区的范围越小，衬砌结构受到的内力越小，隧道越安全。

Influence of Seepage Action in Fractured Rock Mass on Stability of Tunnel Surrounding Rock

When a tunnel runs across the area of joint fissure development, water pressure and joint fissure have effect on the stability of surrounding rock after excavation. Based on a tunnel project, considering fluid-structure interaction and adopting discrete element theory, the influence of water level elevation and normal stiffness of vertical joint on convergence of displacement around the hole, shear stress and plastic zone of surrounding rock and force of supporting structure after the tunnel excavation is analyzed. The results show that within a certain range, the higher the water level elevation and normal stiffness of vertical joint, the smaller the plastic zone of surrounding rock and the inner force of lining structure, the safer the tunnel.