Abstract: This paper presents a case history of a deep foundation project of SUDI 2012-G-17 block near Baodai Road Station of Suzhou Rail Transit Line No.3. Based on the relative location of the deep excavation to the station structure and the characteristics of rail transit structure, the safety hazards of deep foundation engineering were theoretically evaluated, and a three-dimensional simulation model was established to simulate and analyzed the construction process of the foundation excavation, backfilling, and the stress deformation of rail transit station. The results show that the deep and large foundation is excavated in different areas, and the influence of the construction method of “far first and then near” on the structure of rail transit station is within the control range of the specification. The deformation of adjacent rail transit structure mainly occurs in the excavation and back construction stage of foundation pit. The principle of “slotting support, supporting first and then excavation, layered excavation and over excavation” are followed in the excavation of foundation pit, which can effectively reduce the deformation and deformation of station structure Displacement to ensure the operation safety of the station.

Key words: Deep and Large Foundation Excavation, Rail Transit, Station Structure, Numerical Simulation, Safety Hazards