【摘要】 以深圳市某深基坑开挖实测数据为基础，通过反分析程序得到土体相关的物理力学参数，然后采用有限元软件ABAQUS进行数值计算，分析渗流条件下分层开挖对基坑变形影响，主要分析了基坑底部土体隆起、开挖后基坑变形、地下连续墙变形，同时改变强渗透性土层的渗透系数分析基坑的变形情况.运用反分析程序与有限元软件结合的形式对实际工程的施工过程进行模拟，将模拟的结果与实际监测结果进行对比.结果表明，运用反分析程序与有限元软件结合计算的基坑变形情况更接近实际情况，强渗透性土层渗透系数变化时对基坑底部土体隆起的影响最大.更多还原

【Abstract】 Based on the measured data during the excavation of a deep foundation pit in Shenzhen, the physical and mechanical parameters of soil are obtained by back analysis program. After obtaining the soil parameters in line with the actual conditions, the finite element software ABAQUS is used for numerical calculation to analyze the influence of layered excavation on the deformation of foundation pit under seepage conditions, mainly including the uplift of the soil at the bottom of the foundation pit, the deformation of the foundation pit after excavation, and the underground. The deformation of the diaphragm wall and the permeability coefficient of the strong permeability soil layer are changed to analyze the deformation of the foundation pit. The back analysis program and finite element software are used to simulate the construction process of the actual project, and the simulation results are compared with the actual monitoring results. The results show that the deformation of foundation pit calculated by the combination of back analysis program and finite element software is closer to the actual situation. The change of permeability coefficient of strong permeability soil layer has the greatest impact on the uplift of soil at the bottom of foundation pit.更多还原