Abstract: The influence of the deep excavation on adjacent structures has always been a hot button issue. The shielded tunnel structure is sensitive to the deformation. The influence of excavation on the deformation of the existing tunnel deserves special attention. Seventeen existing subway shielded tunnels in Hangzhou area are selected as examples to study the influence of excavation on the deformation of the tunnel structure, and to analyze the influence of spatial parameters such as the horizontal net distance, the relative height difference and the excavation depth between the excavated area and the tunnel. The results show that the unloading of the deep excavation will cause the additional deformation of the adjacent tunnel structure, and the horizontal displacement is usually larger than the vertical settlement. The influence of the tunnel deformation decreases non-linearly with the increase of the horizontal net distance from the excavated area. The settlement of tunnel increases linearly with the increase of excavation depth, and the sensitivity of different excavation depth is different.

Key words: Deep Excavation, Shielded Tunneling, Displacement and Deformation, Statistical Analysis