Abstract: A utility culvert need to be installed near a viaduct of the metro subway structure. The unloading deformation in the viaduct structure induced by the excavation of this utility culvert needs to meet the requirement of the safe operation of the subway. According to past experience, the impact of foundation excavation construction on the surrounding environment is mainly at the excavation stage. Therefore, the strong support form of soldier piles with internal support was adopted in the design of deep excavation near the subway. The three-dimensional finite element modeling method was used to simulate the displacement of the soil and subway viaduct in all directions during the excavation. The calculation and analysis results show that the deformation of the subway viaduct caused by the deep excavation conforms to the general trend. After taking the targeted measures for the deformation control, the utility culvert construction meets the requirements for the subway protection. The research results can provide a reference for the implementation of other similar projects within the influence range of subway.

Key words: Metro Subway Protection, Utility Culvert Excavation, Viaduct, Deformation Analysis, Finite Element