(上海市建筑科学研究院有限公司， 上海市 200032)
周炜（1968—）， 男， 本科， 高级工程师， 从事岩土工程试验研究工作。
Taking the foundation pit project of a commercial office building in Shanghai as the background, aiming at the impact of foundation pit excavation on the surrounding ground settlement, ground diaphragm wall, water level and enclosure structure, the whole process of monitoring and measuring during the excavation process is carried out, and its rule is analyzed. The research results show that the surrounding ground settlement increases at different rates with different excavation depths of the foundation pit. The settlement of the upper part of the excavated foundation pit is slower, and the settlement rate increases at the middle and lower layers of excavation. The excavation of the foundation pit causes the less displacement at the up and down of the ground diaphragm wall and larger displacement at the middle, and the largest deformation is located at the lowest bottom of the foundation pit. The excavation of the foundation pit causes the surrounding groundwater level dropping rapidly. The water level outside the pit rises again and stabilizes until the end after the completion of closing construction of lining wall. The supporting axial force increases with the increment of excavation depth of foundation pit. The supporting axial force gradually stabilizes after the baseplate pouring of foundation pit.