城市建设高速发展，地下空间开发需求逐步增大，深基坑工程日趋增多。合理的支护结构和支护强度是深基坑安全施工的重点，也是近年来岩土工程技术人员关注的热点。地下连续墙支护因其墙体刚度大和整体性好等诸多优点，在深基坑工程中得到了广泛应用，对软土等特殊地层超深基坑，通常会选择地下连续墙和钢筋混凝土支撑联合支护，但目前对于支护结构设计计算、基坑变形及稳定性分析等方面还不能很好的满足工程实际需求。 本文在总结分析基坑、支护结构变形产生机理和变形形式的基础上，重点对地下连续墙计算方法进行了探讨。以天津某金融中心深基坑工程为背景，利用修正后的弹性法对基坑轴力及变形进行理论计算；运用FLAC3D数值软件对基坑周边道路及支护结构变形进行模拟计算，分析其变化规律；设计并实施了基坑施工期间监测方案，对监测数据进行了分析，重点研究了地下连续墙深层水平位移、墙顶垂直位移、内支撑轴力、周边道路的变形规律，探讨了基坑稳定性。主要研究成果如下： （1）对天津某金融中心基坑稳定性进行了验算，得到安全系数KL为2.5，该值大于《建筑基坑支护技术规程》规定的限值1.8，表明基坑支护安全稳定。 （2）基坑变形数值模拟计算结果表明，随着基坑的开挖，周边土体持续沉降，并且呈现三角形分布形态，基坑底部呈现隆起现象，隆起度和土体水平位移量随土体的不断开挖而变大，地连墙水平位移量的最大值出现在基坑开挖深度三分之二处，内支撑始终处于受压状态，内支撑的架设能够有效减少水平位移。 （3）基坑监测分析结果表明，地连墙深层水平位移呈增长趋势，各工况下增长幅度不同，其变形速率表现为先加快随后趋于稳定，内支撑轴力表现为增长趋势，周边道路沉降呈三角形形式，所有监测值均小于报警值。 （4）监测数据与模拟计算结果对比分析表明，数值模拟模型及计算参数选取合理，可为类似深基坑工程设计施工提供参考。

With the development of modern society industry, the development of underground space gradually increases; there are more and deep foundation pit projects. Reasonable supporting structure and supporting strength is the key point to deep foundation pit safety construction, and also the hot point which is concerned by geotechnical engineering technicians nowadays. Underground diaphragm wall is widely used in deep foundation pit due to its high rigidity and great integrality etc. numerous advantages, the supporting pattern of combination of underground diaphragm wall and reinforcement concrete is generally used in some super deep foundation pit construction in soft soil area etc. special stratum super deep foundation pit , but the calculation of supporting structure design, foundation pit deformation and stability analysis etc. still cannot fully meet the practical requirement of project. The Thesis focus to discuss the calculation method of underground diaphragm wall on the basis of summarizing and analyzing the deformation generating mechanism and deformation pattern of foundation pit and maintenance structure. Use the revised elastic method to do the theoretical calculation for foundation pit axial force and deformation on the background of some financial center deep foundation pit in Tianjin; Use FLAC3D numerical software to do the simulative calculation of the surrounding road of foundation pit and supporting structure deformation, and analysis its varying pattern; Design and implement the foundation pit construction period monitoring proposal, and analyze the monitoring data. Focus to study the underground diaphragm wall deep level horizontal displacement，coping vertical displacement, interior supporting axial force and the surrounding road varying pattern, discuss the stability of foundation pit. The main study results are as the followings: (1) Do the checking calculation of stability of some financial center foundation pit in Tianjin, gets the safety factor KL 2.5, which is bigger than the maximum value of 1.8 stipulated in Technical Specification of Retaining and Protecting for Building Foundation Excavation, and it show that the retaining and protection of foundation pit is safe and stable. (2)The numerical simulation result of foundation pit deformation shows the surrounding soils continuously settling with the foundation excavation, and appears triangular distribution pattern. The bottom of foundation pit appears uplift; the uplift degree and soil horizontal displacement expand with the continuous excavation of soil, the maximum displacement of underground diaphragm wall appears in two thirds of the depth of foundation excavation area, interior support is always in press condition, the setup of interior support can effectively reduce the horizontal displacement. (3)The monitoring and analyzing result of foundation pit shows that the horizontal displacement of underground diaphragm wall shows the tendency of rising, and its rising degree varies under different construction, its deformation rate accelerates in the beginning and tends to be stable followed. Interior support shows the tendency of rising, the surrounding road settlement appears triangular pattern, all the monitoring data is less than the alarming value. (4)Compare and analyze the monitoring data with simulation value, the result shows the selection of numerical simulation model and calculation parameter is reasonable, which can provide the reference for similar project design construction.