Numerical analysis of influence of deep excavations on adjacent subway tunnels

Based on the deep excavation of the building of Shenzhen Branch of China Merchants Bank, considering the interaction between soils and tunnel linings, the impact of excavation on the adjacent subway tunnels is studied by using the finite element software ABAQUS. The calculated results indicate that the influence of foundation excavation on the adjacent subway shield zone is small, and the surface settlement and displacement of values linings are in the limited range. The surface settlement and tunnel lining displacement become larger with the deeper excavation, which have a higher growth rate with the larger distance between the inner support. The horizontal displacement of tunnels is significantly lower than that of the retaining piles considering the interaction between soils and linings. Therefore, the pipe-soil interaction should be considered when analyzing the impact of excavation on large-diameter pipes.