Abstract: Based on the construction of the new roadway and river excavation across the shielded tunnel section from Qingshuwan Station to Huagang Station of Suzhou Rail Transit Line No. 4, and based on the relative positional relationship among the roadway, the river and the shielded tunnel section, as well as the structural characteristics of the shield tunnel section, a three-dimensional numerical analysis model is established to simulate and analyze the impact of the new roadway and river excavation on the stress and deformation of the existing shielded tunnel section structure. The results show that the river excavation and the unloading can cause uplift and deformation of the shielded tunnel section below. It is necessary to reasonably arrange the excavation sequence of the river above the rail transit project to minimize the unloading exposure time; Roadway construction and subsequent roadway traffic operations may cause settlement and deformation of the shielded tunnel section below. The construction surcharge load and the heavy machinery should be kept away from the track control protection zone. The research results provide a reference for the construction design of adjacent rail transit roads and river courses.

Key words: New Roadway, River Excavation, River Backfilling, Numerical Simulation, Rail Transit Tunnel, Safety Hazards