考虑地下水渗流影响的衬砌隧洞弹塑性分析

考虑地下水渗流场的作用，将含水围岩作为两相介质体，视外水压力为渗透水作用在围岩和衬砌应力场中的体积力，分别考虑围岩与衬砌的渗透系数，并基于岩体应变非线性软化特征，对衬砌隧洞进行弹塑性分析，得到了渗流场作用下围岩与衬砌的应力和位移解析计算式，并得到围岩开始产生屈服的极限应力。计算表明，当考虑渗透水压力作用时，围岩径向应力和切向应力都增大，并使围岩塑性区扩展；当隧洞围岩、衬砌材料的渗透系数差异显著时，不能简化为等渗透系数处理。

Elastico-Plastic Analysis of Lined Tunnel in Under-ground Water Permeation

As a porous medium,rocks are affected by under-ground water permeation.The seepage stress fieldshould be added to stress field.According to strain nonlinear softening constitutive model,the stress distribution laws,plastic zone,and the displacements of surrounding rock and liner are obtained.The critical stress leading to the yield zone firstly for the surrounding rock is introduced.The results show that the radial stress and tangential stress with considering the influence of seepage water pressure are lar...