Abstract: In order to study the influence of buildings on the deformation characteristics and mechanical behavior of the retaining structures during the excavation of the deep foundation pit of the adjacent subway station, and the interaction characteristics of the retaining structures, soil and the adjacent buildings during the excavation of the foundation site, this paper provides on  the background of the deep excavation project of Nanchang Metro Line 2 subway station passing through the adjacent high-rise buildings. The finite element analysis software MIDASGTSNX is used to establish a three-dimensional simulation model of the deep excavation construction of the subway station and the adjacent buildings. The horizontal displacement and stress characteristics of the underground diaphragm wall, the stress characteristics of the internal support, the surface settlement of the surrounding soil and the stress characteristics of the adjacent building structures under different construction conditions are simulated and analyzed. The results are compared with the simulations results without buildings. The mechanical behavior characteristics of the interaction between the deep excavation of the subway station and the adjacent building structures are obtained. The comparative study results can provide a reference for the design and construction of the deep foundation pit of the subway station.

Key words: Subway Station, Deep Excavation, Adjacent Buildings, Interaction Analysis, Finite Element Simulations