三峡船闸高边坡降雨入渗的三维数值仿真

基于反映裂隙岩体渗透张量各向异性特性的广义达西定律与相对透水率等裂隙岩体渗流基本理论，应用三维非线性有限元方法，对长江三峡工程永久船闸高陡边坡在连续降雨条件下裂隙岩体饱和-非饱和、非恒定渗流扩散过程进行了三维数值仿真分析，得出了连续降雨条件下船闸高陡边坡裂隙岩体渗流场的时空分布规律及典型降雨时段闸室混凝土衬砌上的最不利外水压力荷载，对暴雨入渗情况下闸室边墙稳定性与安全性进行了评价。分析结果表明，闸室混凝土衬砌具有较高的安全度；船闸高陡边坡内排水系统效果显著，即使遭遇长期强降雨，闸室衬砌上的外水压力荷载受降雨的影响也不大。

Three-dimensional numerical simulation on perclolation of rainfall in rock mass slope of Three Gorges Project ship lock

Based on the generalized Darcy’s Law which can describe the anisotropy of infiltration tensors and the relative permeable degree theory related to relevant fundamental seepage theory of a fractural rock mass, 3-D nonlinear finite element method was applied to simulate the process of three dimensional saturated-unsaturated and unsteady percolation diffusion in the high slope of the Three Gorges Project(TGP) permanent shiplock during continuous rainfall. The distribution of infiltration fields in the slope during continuous rainfall and the maximum value of the external water pressure acting on the concrete lining wall were reached in the different typical rainfall time. The authors can evaluate further the influence of the rainfall infiltration on stability and safety of the lining wall of TGP ship lock. Results can demonstrate that the concrete lining wall of TGP shiplock chambers has more larger safety, and the drainage system designed in the TGP ship lock slope is in good conditions, the influence of rainfall on the external water pressure will be small especially very strong rainfall continuous rainfall.