基于位移反分析的深基坑渗流-应力耦合研究  

Study on seepage-stress coupling of deep foundation pit based on displacement back analysis

作　　者：汤小林 董建华[1,2] 吴晓磊 王璐[1,2] TANG Xiao-lin;DONG Jian-hua;WU Xiao-lei;WANG Lu(School of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Western Center of Disaster Mitigation in Civil Engineering,Ministry of Education,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2024年第5期139-146,共8页Journal of Lanzhou University of Technology

基　　金：甘肃建设科技攻关项目(JK2018-40,JK2019-08);教育部产学合作协同育人项目(22107031081835,22097031305424)。

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.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.

关 键 词：反分析 渗流 深基坑 有限元 变形 

分 类 号：TU473[建筑科学—结构工程]