三峡永久船闸高边坡三维饱和——非饱和渗流场分析

Three-dimensional Analysis of Saturated-unsaturated Seepage of Three Gorges Project Permanent Ship Lock

三峡2号永久船闸高边坡在降雨入渗条件下闸室混凝土衬砌边墙的外水压力可能很大,有工程后患之虑。论文针对这个三维降雨入渗复杂渗流场问题,采用基于广义达西定律理论之上的非稳定饱和———非饱和渗流场求解的有限单元法,对不利的连续数天降暴雨情况下的不同时刻的边坡渗流场特性进行计算分析,给出各个典型时刻2号船闸高边坡体中渗流场等水头线和闸室混凝土衬砌墙背面外水压力水头的大小,并与设计允许值进行对比分析,进而给出降雨入渗对闸室边墙稳定的影响程度,有无破坏性作用等。

The No.2 ship lock slope of Three Gorges project is so high that may leads to high water pressure on the thin concrete lining wall in the gate chambers under the condition of rain infiltration, which may result in some dangers to the ship lock. The authors use 3D FEM for unsteady saturated-unsaturated seepage to solve the complicated problem, which is based on the generalized Darcy's law.The No.2 ship lock's seepage field in the bank under a continuous rainfall is calculated and evaluated. The isolines of hydraulic heads and water pressure on the thin concrete lining wall of the ship lock are given out as a result. After compared with the ultimate value, the authors can numerically determine the influences of rain infiltration on the stability of the lining wall of the ship lock.