考虑流-固耦合的隧道开挖数值模拟

根据隧道工程施工实际情况和地下水渗流的基本规律，以及弹塑性力学理论，建立了在应力场和渗流场耦合作用下隧道开挖数学模型，借助Comsol模拟了隧道开挖过程中围岩应力场及渗流场的变化规律。研究结果表明：在原岩开挖时，隧道围岩变形及地面沉降大，不利于周围建筑的安全，隧道内积水，施工无法进行；进行灌浆处理后，围岩变形小，地面沉降得到控制，有利于施工及周围建筑的安全。

Numerical simulation of tunnel excavation considering fluid solid coupling

According to the execution situation of the tunnel project, the theory of elastoplastic mechanics and the seepage law of groundwater are taken into account; a mathematical model considering seepage-stress coupling of the tunnel is established; seepage and the stress field around the tunnel in different working states are simulated by applying Comsol. The results indicate that during the process of excavation without any measures, deformation of the soil around the tunnel occurs; the deformation of the rock and the settlement of the ground are large; the buildings nearby are in danger and the groundwater infiltrates into the tunnel; the project can’t be conducted; after grouting, the deformation of the rock around the tunnel is reduced and the settlement of the ground is controlled; then the buildings nearby are safe and the tunnel excavation can be processed safely.