Abstract:Compared with seismic coefficient method and response displacement method,dynamic finite element method could well simulate the seismic wave propagation in the soil and the dynamic interaction between the structure and the soil more effectively. It is regarded as one of the most rational approaches in seismic response analysis of underground structures. The existence of various types of joints,one of the typical characteristics of prefabricated lining structures,makes the mechanical performance of shield tunnel linings quite different from that of monolithic linings. The beam-spring model is widely deemed to have the capacity in simulating the actual mechanical behaviors of shield tunnel linings with torsion and shear springs being used to simulate the segment joints and longitudinal joints of the linings,respectively. However,in this model,the soil layers surrounding the tunnel can be also simulated by springs,which confines it to static or quasi-static analysis. Combining the dynamic finite element method and the beam-spring model,a new transverse seismic response analysis method of shield tunnel is presented,while multi-transmitting boundary conditions are also introduced in the numerical calculation to acquire high computational efficiency and precision. Then,this approach was adopted to calculate the transverse seismic response of Wuhan Changjiang Tunnel,with emphasis on the effects of different structural parameters on the structure¢s seismic behaviors;and the results show that the variation of the stiffness of the segment joints and longitudinal joints,as well as the depth of the segments,have distinct influences on the internal force,especially the shear force and the moment,rather than the deformation of the linings. The increase of any of the three parameters mentioned above would lead to notable increase of the internal force,and strengthening the soil foundations with proper method could reduce both the deformation and the internal force,and it has visible vibration-reduction effects.