Deformation Monitoring and Simulation Analysis of Deep Foundation Excavation Construction for subway station

Abstract Based on the excavation of deep foundation pit near water for subway, retaining structure of the foundation pit and its deformation monitoring program were designed; in-situ monitoring data of the retaining structure deformation in the foundation pit were analyzed. The horizontal deformation of the retaining structure changing with the excavation depth and time were carried out. 3D finite element model was built to simulate the do construction process of the station foundation pit; FEM results and in-situ monitoring results of retaining structure deformation were compared. The results showed that: the retaining form with steel support and supporting pile had good limit to the lateral deformation of the foundation pit soil. The results calculated by FEM were consistent with the in-situ monitor results; according to monitoring data and the results of numerical simulation, the next deformation law and maximum deformation of the foundation pit excavation were predicted, which showed that foundation pit retaining structure design was reasonable and safety. The simulated results provide valuable reference for these similar engineering.