Abstract: In this paper, a deep foundation excavation project adjacent to the subway tunnel is taken as an example, and the three-dimensional model of the deep excavation near the existing tunnel is established by the numerical simulation software to study the influence of deep excavation construction on the adjacent tunnel. Throughout the comparative analysis, the need of considering the operative subway load is further clarified, and the deformation relationships in the excavation and the existing subway tunnel are evaluated in the paper. The results show that the deformation of the existing tunnel induced by the deep excavation construction in subway operative period is significantly greater than that in non-operative period; With the increase of the horizontal distance between the excavated area and the tunnel, the deformation of the deep excavation supporting structure and the tunnel gradually decreases, and the influence is smaller and smaller; When the tunnel is in the middle portion of the diaphragm wall, that is, the maximum horizontal displacement of the diaphragm wall, the influence of the diaphragm wall and the tunnel is the most significant.

Key words: Deep Excavation, Operative Tunnels, Diaphragm Wall, Numerical Simulation