大型地下洞室群围岩应力-损伤-渗流耦合分析

以渗透体力来考虑渗流场的力学效应，建立了应力-损伤-渗透系数关系方程来考虑应力和损伤对渗流场的影响，结合岩体结构的三维弹塑性损伤有限元分析，建立了大型地下洞室开挖围岩应力-损伤-渗流耦合的计算模型。该计算模型求解的难度主要体现在岩体材料弹塑性、损伤、渗流自由面边界、渗流溢出边界、应力-损伤-渗流相互影响关系等。提出分步迭代法对以上因素进行归纳后按一定顺序分别进行迭代求解，取得了良好的计算效果。将该方法应用于某水电站大型地下洞室群分析，得出了一系列有意义的结论。

Stress-damage-seepage coupling analysis of surrounding rock of large-scale underground caverns

Seepage field force is calculated to reflect the force effect of seepage flow field. Relationship equation of stress-damage-seepage is built to consider the effect of stress and damage on seepage flow field. Combined with 3-dimension elastoplastic-damage finite element analysis of rock mass, stress-damage-seepage coupling analysis model of large-scale underground surrounding rock is established. The difficulties of solving the model mainly lay on elastoplasticity of rock material, damage, free surface boundary of seepage flow, escaping surface boundary of seepage flow, interaction of stress-damage-seepage, etc. Considering the difficulties, the sequential iteration method is proposed to solve the difficulties by several sequential iterations; and nice calculation result is obtained. The method is used to analyze the large-scale underground caverns of a hydropower station, and a series of useful conclusion is made.