Analytical solution to longitudinal seismic response of fault-crossing tunnel with segmented flexible joints
YAN Gaoming1,2, ZHAO Boming1,2, GAO Bo3, WANG Zijun1,2
1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
3. Key Laboratory of Transportation Tunnel Engineering， Ministry of Education， School of Civil Engineering，Southwest Jiaotong University, Chengdu 610031, China
Abstract：The areas where tunnels run through faults are seriously damaged in earthquakes, which are the key areas for seismic design. The flexible joint is an effective measure of anti-seismic and damping measures for tunnels through fault. First, in view of the fact that there are few seismic design methods for flexible joints of tunnels through faults, a mechanical model of flexible joint is proposed based on the seismic damage characteristics of tunnel and the design concept of flexible joint, and a simplified analysis method for longitudinal seismic of fault-crossing tunnels with flexible joint is established for engineering design. Then, the effectiveness and feasibility of the proposed method are verified by comparing with the finite element numerical solution and the existing research. Finally, the sensitivity analysis of parameters is carried out using the proposed method to reveal influences of parameters on seismic responses of tunnels through fault. The results show that: (1) The flexible joint can increase the allowable deformation capacity of the tunnel lining, reduce the internal force of the tunnel lining effectively, and localized the influence of fault on the dynamic responses of the tunnel. No matter whether the joint is set up or not, the disadvantageous position of the stress for tunnels through the fault is mainly distributed in the middle of fault area and the interface between hanging wall, footwall and fault, which are the key areas of seismic fortification; (2) Increasing the bending stiffness of the lining can reduce the displacement responses of the lining and increase the displacement differences of lining at the position of the two joints, but at the same time significantly increase the internal force responses on the lining; (3) With the increase of the width of the fault fracture zone, the displacement and bending moment of the tunnel increase, while the maximum shear force increases first and then decreases. The influence ranges on the dynamic response of the tunnel along the axial direction increase when the width of the fault fracture zone increases.
Key words: tunnel engineering; flexible joint; longitudinal seismic response; analytical method; fault
闫高明1,2，赵伯明1,2，高波3，王子珺1,2. 穿越断层分段柔性接头隧道纵向地震响应解析解[J]. 振动与冲击, 2022, 41(13): 228-238.
YAN Gaoming1,2, ZHAO Boming1,2, GAO Bo3, WANG Zijun1,2. Analytical solution to longitudinal seismic response of fault-crossing tunnel with segmented flexible joints. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(13): 228-238.
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