【摘要】 提出基坑开挖中作为挡土墙的地下连续墙视为支撑在弹性地基上板的模型，假定土压力是位移的函数，挡土墙内创支撑的作用采用杆单元刚度矩阵表示波动区土体支撑作用，采用Boussinesq解积分建立地基柔度矩阵，挡土墙本身来用厚板理论求出板的刚度矩阵，得到总体平衡方程，解方程及回代，求得档土墙任意点的位移和各道支撑的轴向力．最后以上海某基坑工程为例进行计算，计算值与实测值较吻合，模型为基坑开挖围护结构设计提供了一个实用的计算方法．更多还原

【Abstract】 This paper provides a raft model in which diaphagm wall is used as retaining wall braced on elastic subgrade. It is assumed that earth pressure is the function of displacement. The action of brace is substituted by bar element stiffness martix. Foudation soil flexibility matrix is computed by Boussinesq’s solution. The stiffness matrix of retaining wall is calculated by thick raft finite element model. The total equilibrium equations are derived. Solving the equations, the displacement of every point of retaining wall and braced axial force are obtained. Finally, this paper gives an example of deep excavation in Shanghai, and the calculated value is in agreement with measured data. This model provides a useful method for bracing design in deep excavation.更多还原