以上海500 kV世博地下输变电站为工程背景，以Biot固结理论为基础，采用数值方法对深基坑降水开挖过程进行了流固耦合分析．模拟抽水试验，并采用位移和孔压反分析法确定土层计算参数．建立流固耦合分析模型，分别采用稳态分析法和生死单元法模拟基坑的降水和开挖过程，同时求解出渗流场和位移场的变化．通过计算值与实测值的比较，证明了流固耦合方法分析基坑降水的正确性和可行性．

On the background of 500 kV Shanghai Expo underground substation, a fluid-structure coupling FEM analysis of dewatering and excavation was made based on the Biot's consolidation theory. A pumping test was simulated to determine soil parameters by back-analysis of displacement and pore pressure. A fluid-structure coupling model was built to analyze dewatering and excavation with steady analysis method and birth-death element method respectively. Seepage and stress fields were solved at the same time. With comparison of the calculated and measured values, the fluid-structure coupling method used in the analysis of dewatering and excavation was proved to be correct and feasible.