ABSTRACT
Based on the deep foundation pit engineering of a subway station working well in Jinan, this paper uses the finite element software MIDAS GTS/NX to simulate the various construction stages of the deep foundation pit excavation. Through the analysis of field monitoring data, it is concluded that with the increase of foundation pit excavation depth, the horizontal displacement of the underground diaphragm wall and the surrounding surface settlement displacement are increasing. The maximum horizontal displacement of a deep layer is 12.8 mm during cushion construction; the surface subsidence displacement reaches the maximum at the edge distance of about 4 m away from the foundation pit. The simulation results are compared with the actual monitoring data, and the deformation law is basically consistent with the field monitoring. This paper discusses the influence of diaphragm wall thickness on foundation pit deformation: when the wall thickness is less than 1.0 m, the deformation of the diaphragm wall changes greatly, which has a great influence on the safety of the foundation pit.
