Impact of surface-reflected seismic waves on the seismic isolation performance of circular tunnel isolation layers  

作　　者：LU Jiahui LUO Junjie HUANG Xiangyun HONG Junliang HE YanXin ZHOU Fulin 

机构地区：[1]Department of Civil Engineering,Xi’an University of Architecture and Technology(XAUAT),Xi’an 710055,China [2]Earthquake Engineering Research and Test Centre,Guangzhou University,Guangzhou 510623,China [3]Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology,Guangzhou University,Guangzhou 510623,China [4]Key Laboratory of Earthquake Resistance,Earthquake Mitigation and Structural Safety,Ministry of Education,Guangzhou University,Guangzhou 510623,China

出　　处：《Journal of Mountain Science》2024年第3期901-917,共17页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China[grant number 51991393];support from the Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology and Key Laboratory of Earthquake Resistance,Earthquake Mitigation,and Structural Safety funded by the Ministry of Education。

摘　　要：Seismic isolation is an effective strategy to mitigate the risk of seismic damage in tunnels.However,the impact of surface-reflected seismic waves on the effectiveness of tunnel isolation layers remains under explored.In this study,we employ the wave function expansion method to provide analytical solutions for the dynamic responses of linings in an elastic half-space and an infinite elastic space.By comparing the results of the two models,we investigate the seismic isolation effect of tunnel isolation layers induced by reflected seismic waves.Our findings reveal significant differences in the dynamic responses of the lining in the elastic half-space and the infinitely elastic space.Specifically,the dynamic stress concentration factor(DSCF)of the lining in the elastic half-space exhibits periodic fluctuations,influenced by the incident wave frequency and tunnel depth,while the DSCF in the infinitely elastic space remain stable.Overall,the seismic isolation application of the tunnel isolation layer is found to be less affected by surface-reflected seismic waves.Our results provide valuable insights for the design and assessment of the seismic isolation effect of tunnel isolation layers.

关 键 词：Circular tunnel seismic isolation Surface reflection Response of liners Wave-function expansion method 

分 类 号：U452.28[建筑科学—桥梁与隧道工程]