防灾减灾工程学报2025，Vol.45Issue(6)：1434-1443,1454,11.DOI:10.13409/j.cnki.jdpme.20250430053
断层场地非线性驱动的跨断层隧道地震响应机制研究
Study on Seismic Response Mechanism of Cross-fault Tunnels Driven by Fault Site Nonlinearity
摘要
Abstract
To reveal the influence of nonlinear characteristics of fault sites on the seismic response mechanism of cross-fault tunnels,the dynamic response of tunnel structures under the driving effect of site nonlinearity was systematically analyzed using shaking table model tests.The results indicated that the fault site exhibited a pronounced three-dimensional spatial response,where the reflection and refraction of seismic waves amplified high-frequency components and induced additional vibration com-ponents.Moreover,as seismic intensity increased,the site demonstrated nonlinear behavior,includ-ing shear modulus degradation and enhanced damping.The acceleration responses of the cross-fault tunnels were characterized by spatially heterogeneous distribution,with the most pronounced response concentrated at the fault interface zone,whose spectral characteristics were jointly controlled by site effects and seismic input.Tunnel damage was dominated by shear deformation,with deformation mag-nitudes in the fault zone significantly exceeding those of the surrounding rock,and the inter-segment differential deformation increasing nonlinearly with seismic intensity.Lining damage evolution exhibit-ed strong spatial correlation,with cracks tending to propagate obliquely along the fault interface.Vari-ations in structural dynamic properties effectively reflected the stiffness degradation process.These findings reveal the seismic damage mechanism of tunnels under nonlinear fault site effects,thereby providing a theoretical basis for the seismic design of cross-fault tunnels.关键词
跨断层隧道/断层场地/地震响应/振动台试验/非线性响应Key words
cross-fault tunnels/fault site/seismic response/shaking table test/nonlinear response分类
交通工程引用本文复制引用
LI Ruohan,YUAN Yong,ZHAO Xu..断层场地非线性驱动的跨断层隧道地震响应机制研究[J].防灾减灾工程学报,2025,45(6):1434-1443,1454,11.基金项目
国家重点研发计划(2022YFB2302103)、国家自然科学基金项目(51778487)资助 （2022YFB2302103）
