Monitoring and Numerical Simulation of Excavation Process of in an Foundation Pit Open Excavation Station

The finite difference software FLAC^3D was used to numerically simulate the lateral deformation of bored piles of the retaining structure, the ground settlement around the foundation pit, and the supporting axial forces at different plane positions during the excavation of Wuhu Railway Station. Their change regularities during the excavation process were analyzed and compared with the actual monitoring results. The results show that with the excavation of foundation pit, the maximum lateral deformation point of the bored pile moves down the pile body, and the lateral deformation increases, and the lateral deformation of the bored pile at each position shows the same trend. With the increase of excavation depth of the foundation pit, the soil settlement after the retaining structure of foundation pit increases, and the maximum settlement occurs about 3.5 m behind the retaining structure.The reinforced concrete support plays an important role in the supporting system. The numerical simulation results of foundation pit are close to the monitoring results, and the change rules are basically the same. These analysis results can provide reference for the construction and design of similar station foundation pit.