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以某城市大型地铁车站基坑为研究背景,对基坑围护结构及其变形监测方案进行了设计,并对基坑围护结构变形的现场监测数据进行了分析,重点分析了基坑施工过程中围护结构的水平变形随基坑开挖深度和时间的变化规律。建立了弹塑性有限元模型,并对地铁车站深基坑开挖进行施工仿真模拟计算,将获得的围护结构变形结果与监测结果进行了对比分析,再引用多种围护形式对基坑变形进行敏感性因素分析。结果表明:钢支撑+围护桩的围护形式对基坑土体的侧向变形有较好的限制作用,有限元数值计算结果与现场实测结果比较一致,有限元计算的结果是可信的,改变钢支撑的施作位置对限制基坑的侧向变形有重要作用。随着围护桩入土深度的增大,土体向基坑内侧变形的趋势有所减缓。
Taking the foundation pit of a large metro station in a city as the research background, the design of the retaining structure and its deformation monitoring scheme is studied, and the on-site monitoring data of the deformation of the foundation pit retaining structure are analyzed. The construction process of the foundation pit In the retaining structure of the level of deformation with the pit excavation depth and time changes. The elastic-plastic finite element model is established, and the construction simulation of deep foundation pit excavation in metro station is carried out. The deformation and the monitoring results of the retaining structure are contrasted and analyzed, and then the deformation of the foundation pit Conduct a sensitivity analysis. The results show that the support form of steel support + retaining pile has a good effect on the lateral deformation of foundation soil. The results of finite element calculation are in good agreement with those of on-site measurements. The results of finite element analysis are credible , Change the location of the steel support to limit the lateral deformation of the pit has an important role. As the depth of the retaining pile into the soil increases, the tendency of soil deformation to the inner side of the pit has slowed down.