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基坑变形预测是分析基坑开挖对环境影响的核心内容之一。收集了上海地区65个常见的板式支护体系基坑工程案例,并对其进行了分类。对不同类型的板式支护体系基坑建立不同的基于土体HS-Small模型的平面应变有限元模型进行分析。根据室内土工试验结果与基于实测数据的参数反演分析,确定了上海软土地区典型土层土体的HS-Small模型计算参数。通过对108个有限元计算结果的分析及归一化,推导了能够综合考虑基坑系统刚度、基坑深度和基坑宽度的上海地区板式支护体系基坑围护结构最大侧移和地表最大沉降的简化计算公式,并且提出了基坑围护结构侧移曲线和地表沉降曲线,同时也给出了上海地区板式支护体系基坑变形的预测流程。采用本文给出的简化方法预测了上海地区的7个工程的变形并与实测结果进行了比较,结果表明该方法能较好地预测上海地区的板式支护体系基坑的变形。
Deformation prediction of foundation pit is one of the core contents to analyze the environmental impact of excavation. A total of 65 common pit support system foundation pit projects in Shanghai area were collected and classified. Different types of plank supporting system based on the soil to build different soil HS-Small model of plane strain finite element model for analysis. According to the results of indoor geotechnical test and parameter inversion analysis based on measured data, the calculation parameters of HS-Small model of typical soil layer in Shanghai soft soil area are determined. Based on the analysis and normalization of the results of 108 finite element analyzes, the maximum lateral displacement and the maximum surface displacement of the foundation pit retaining structure of the Shanghai-based plate support system can be comprehensively considered considering the stiffness of the foundation pit, the depth of the foundation pit and the width of the foundation pit The simplified calculation formula of settlement and the lateral displacement curve and surface settlement curve of the foundation pit retaining structure are also presented. At the same time, the forecasting process of the foundation pit deformation of the plate support system in Shanghai is also given. The simplified method presented in this paper is used to predict the deformation of seven projects in Shanghai and compared with the measured results. The results show that the proposed method can predict the deformation of the foundation pit of slab supporting system in Shanghai.