Abstract: The urban subway is one of the important means to mitigate the traffic congestion, and the number of subway lines also represents the development status of the city. However, subway tunnels are more sensitive to changes in the surrounding environment, so it is crucial to study the impact of deep excavation construction on nearby subways. This article is based on the TOD Tianjie deep excavation project of Longhu New East Station. The excavation process is simulated using commercial software MIDAS/GTS, and the deformation of the tunnel structure during the deep excavation process is evaluated. The stress of the tunnel structure is checked and predicted. The results indicate that there is a significant change in the surface settlement during the installation of the third and fourth layers of ground anchors at the supporting structure. Special attention should be paid to the deformation of the excavated area and the tunnel structure during this construction phase; The maximum settlement and the maximum horizontal deformation of the tunnel structure are linearly related to the number of excavation steps, but the maximum horizontal displacement deformation is more obvious. To meet the design requirements, the internal force of the tunnel segments during the excavation process meets the original design requirements for the ultimate bearing capacity. The research results provide a basis for the construction of deep excavation adjacent to existing subways and reduce the impact of deep excavation construction on the surrounding environment.

Key words: Deep Excavations, Adjacent Subway Tunnels, Finite Element Analysis, Force and Deformation