The Effect of Foundation Pit Excavations on Adjacent Open-Cut Tunnels for High-Speed Railways

Based on the project of deep foundation excavation of No. 15 Tianjian in Tianjin City, this paper used the finite element software to simulate the entire construction procedure from foundation excavation to applying the load of upper structure, and analyzing the effects of every step on open-cut tunnels of high-speed railway. The results show: the effects on tunnel of horizontal displacement are much greater than the vertical displacement during the deep foundation excavation; with the depth of excavation increasing, the horizontal displacement of the tunnel is much greater, and the tunnel will be leaned; however, after applying load of upper structure, the effects tend to be smaller; as a reinforcement measure, uplift pile can effectively limit the uplift of bottom soil, on the other hand it can reduce the effects on the tunnel during the foundation excavation.