Study on Transverse Seismic Performance of Double Lining of Large Diameter Shield Tunnel
(1. China Railway Siyuan Survey and Design Institute Group Co., Ltd., Wuhan 430063; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 3. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031)
Abstract：
In order to find out the influence of double lining and different construction methods (composite and su? perimposed) of double lining on the lateral seismic performance of shield tunnel, the three-dimensional refinement model of the double lining of shield tunnel is established based on the Jintang Subsea Railway Tunnel of NingboZhoushan Railway, and the nonlinear performance of tunnel materials and contact is considered. The seismic performance is studied by the implicit dynamic time history method. The results of the study show that: (1) the greater the stiffness of the connection between the double lining and the segment, the smaller the tunnel deformation. (2) The composite lining has limited improvement in the circumferential seismic performance of the tunnel, and its deformation, damage and stress patterns are basically consistent with those of the single lining. (3) The superimposed lining can effectively improve the seismic performance of the tunnel and make full use of the mechanical properties of the materials, but it is necessary to focus on the damage to the tunnel. (4) It is recommended to adopt superimposed double lining for sections with high requirements on seismic fortification grade, and composite double lining for special sections with high requirements on waterproofing and fire protection.
CAO Xiangpeng1,
2 FENG Kun2 XUE Haoyun2 MAO Sheng1 YU Bo2,
3
.Study on Transverse Seismic Performance of Double Lining of Large Diameter Shield Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(1): 130-139
2023, Vol. 60 