基于物理震源模型的跨断层隧道地震响应分析方法  

Physics-based seismic response analysis method for tunnels crossing faults

作　　者：罗超 曹晓雨 高阳[3] 徐飞 徐旸 王昊[1,2] LUO Chao;CAO Xiaoyu;GAO Yang;XU Fei;XU Yang;WANG Hao(Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障教育部重点实验室 [2]石家庄铁道大学土木工程学院 [3]石家庄铁道大学安全工程与应急管理学院 [4]中国铁道科学研究院集团有限公司铁道建筑研究所

出　　处：《振动与冲击》2024年第22期293-304,共12页Journal of Vibration and Shock

基　　金：国家重点研发计划(2021YFB2600800);中央引导地方科技发展资金项目(216Z5402G);国家自然科学基金(52078311,52278467);河北省自然科学基金面上项目(E2022210095,E2024210049);河北省重点研发计划项目(21375407D);中国国家铁路集团有限公司科技研发计划(P2022G013);河北省地震科技星火计划项目(DZ2023120500009)。

摘　　要：在跨断层隧道的抗震设计和地震响应分析中,目前存在断层错动与地震动耦合加载物理机制不明确和计算理论不完善的问题。基于物理震源模型和简化波动输入法,提出了一种跨断层隧道地震响应分析框架,可在跨断层隧道地震响应分析中实现断层错动和地震动的耦合加载。通过自由场和土-隧道结构相互作用体系两组算例,对该方法和同震变形场法进行了对比,验证了该方法的正确性和先进性。结果表明:在自由场模型的地震响应分析中,该方法计算的加速度响应结果精度显著优于同震变形场法,两种方法的位移响应结果误差均较小;对于土-隧道相互作用模型的地震响应分析,该方法与同震变形场法在隧道衬砌的加速度、位移、等效应力的计算结果分别最大相差19.20%、3.04%、4.48%,隧道衬砌的位移呈现了显著的跨断层分布特性。该方法可以实现模拟断层错动和地震动对隧道结构的共同作用,计算精度较现有方法更高,可用于跨断层工程结构的地震响应分析。In the seismic design and earthquake response analysis of tunnels crossing faults,the current challenges include the coupled loading of fault displacement and ground motion,with unclear physical mechanisms and imperfect calculation theories.A seismic response analysis framework for tunnels crossing faults was proposed based on a physical source model and a simplified wave input method,enabling to consider the coupled loading of fault displacement and ground motion in seismic response analysis of tunnels crossing faults.Through two sets of cases,one involving a free-field model and the other a soil-tunnel structure interaction system,the results of the proposed method were compared with those of the co-seismic deformation field method,validating the correctness and superiority of the proposed method.The results indicate that:in seismic response analysis of free-field models,the acceleration response accuracy by the proposed method is significantly superior to that by the co-seismic deformation field method,with relatively small errors in the displacement responses for both methods.In seismic response analysis of the soil-tunnel interaction model,the proposed method shows maximum differences of 19.20%,3.04%,and 4.48%in the acceleration,displacement,and equivalent stress calculations of the tunnel lining,respectively,compared to the co-seismic deformation field method.The displacement in the tunnel lining exhibits significant cross-fault distribution characteristics.This method successfully simulates the combined effects of fault displacement and ground motion on tunnel structures,demonstrating higher calculation accuracy compared to existing methods.It is applicable to the seismic response analysis of engineering structures crossing faults.

关 键 词：隧道工程 跨断层隧道 物理震源模型 简化波动输入法 断层错动 

分 类 号：U452.28[建筑科学—桥梁与隧道工程]