关键词: 顶管隧道, 工作井, 轨道交通, 轨道交通隧道, 数值计算

Abstract: Based on the shielded excavation interval between Xiuyi station and Kunshan City Square Station of Suzhou rail transit line No. 11, a three-dimensional numerical model was established. The numerical model considers the relative position of the working shaft of the pedestrian crossing, the jacking tunnel and the shielded excavation tunnel. The stress and deformation of the shielded tunnel during the excavation of the working shaft foundation pit and the jacking construction of the tunnel jacking are simulated and analyzed, which were calibrated with the field monitoring data. The research results show that: the construction of tunnel jacking and working shaft foundation pit finally produces vertical heave deformation of the lower rail transit tunnel, the influence of tunnel jacking construction duration on the disturbance of the lower shield tunnel is greater than that of the working shaft foundation pit of the tunnel jacking, and the tunnel jacking within 5m of the shielded tunnel has the largest heave deformation rate on the shielded tunnel, and the field monitoring data is generally consistent with the numerical calculation, which verifies the rationality of the numerical calculation.

Key words: Tunnel Jacking, Working Shaft, Rail Transit, Shielded Tunnel, Numerical Simulation