Dynamic response analysis of lining structure for shield tunnel under seismic loading
Wang Yixian1 Shan Shengbiao1 Ren Weixin1 Jing Hongwen2 Cao Ping3
1. Hefei University of Technology, Hefei 230009, China
2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
3. Center South University, Changsha 410083, China
Abstract：Shield tunnel as a tool with the effect of alleviating the pressure of ground traffic for big cities, its security is getting more and more attention. Considering the seismic damage may take place in shield tunnels of large cities, the change law of performance of segment in different segment joint model subjected to seismic load were analyzed by implementing a finite software to numerical simulation of the seismic process. According to the results, shield tunnel produces the larger lateral displacement under the lateral seismic action, and the curve trends of lateral displacement of segment with time are basically identical. The lateral displacement of segment increases with the decrease of the segment stiffness, and it is a lot smaller than the lateral displacement of ground. The internal force distribution of segment and connecting bolt in different segment joint model are similar, the lateral and shear direction stress of segment decreases and the axial force, shear force and bending moment of connecting bolt increase with the decrease of the segment stiffness. Beside, the increase size of shear force of connecting bolt is maximum, and the maximum bending moment of connecting bolt locates in two hances of tunnel.
