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通过上海中星城基坑工程地下连续墙围护体系的实施,结合有限元模拟及实测数据分析了基坑开挖对围护结构位移及周边环境的影响。结果表明,地下连续墙技术对深厚软土地层深大基坑具有较高的安全性和经济性;本工程围护结构采用地下连续墙变形小,基坑土体位移增加速率随开挖深度的增加逐渐变缓,并且有稍许回弹;同时,降水过深会对周边环境造成一定影响,应在保证基坑安全的前提下尽量减小降深。
Through the implementation of the retaining wall system of the diaphragm wall in the construction of the foundation pit in Shanghai Zhongxingcheng City, the influence of the excavation on the displacement and the surrounding environment of the retaining structure is analyzed based on the finite element simulation and measured data. The results show that underground continuous wall technology has high safety and economy for deep foundation pit with deep soft soil. The deformation of underground continuous wall of the retaining structure of this project is small, and the rate of increase of the displacement of foundation soil with the excavation depth Increase slowly and slightly rebound; the same time, excessive precipitation will have some impact on the surrounding environment, should be to ensure the safety of the foundation pit to minimize the decline.