穿越上软下硬地层海底隧道衬砌横向地震响应分析  

Analysis of submarine tunnel linings in rising region crossing upper soft and lower hard stratum to transversal seismic load

作　　者：于辉 赵国臣 徐龙军 戴俊卿 陶晓燕 YU Hui;ZHAO Guochen;XU Longjun;DAI Junqing;TAO Xiaoyan(School of Ocean Engineering,Harbin Institute of Technology at Weihai,Weihai 264209,China;China Academy of Railway Sciences Corporation Limited,Beijing 100844,China)

机构地区：[1]哈尔滨工业大学(威海)海洋工程学院,山东威海264209 [2]中国铁道科学研究院集团有限公司,北京100844

出　　处：《地震工程与工程振动》2021年第2期211-218,共8页Earthquake Engineering and Engineering Dynamics

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(K2019G035);国家自然科学基金项目(51908169,51678208)。

摘　　要：海底隧道主体通常埋置于海下基岩内,两端以一定的坡度上升连接至地面,其上岸段通常会穿越不同性质的地层。由于各地层力学性能存在较大的差异,容易引起应力集中,从而导致隧道结构发生破坏。文中以穿越上软下硬地层上岸段海底隧道为研究对象,采用ABAQUS有限元软件建立数值模型,分别使用动力时程分析方法和拟静力分析方法研究穿越不同性质地层的隧道结构地震响应。在动力时程分析中,分别建立了穿越上软下硬地层、均质岩石地层和均质硬土地层3种工况的隧道模型。分析表明,隧道穿越上软下硬地层时,内力最大,且变形不均匀,穿越均质岩石地层时内力最小。在拟静力分析中,通过对土体施加一维等效线性分析得到场地变形计算隧道的反应。分析表明,拟静力分析方法所得结果与动力分析方法所得结果基本吻合,但拟静力法效率更高,更便于复杂隧道结构的地震响应分析。The main part of the submarine tunnel is usually buried in the subsea bedrock,and the two ends are connected to the ground with a certain gradient.Its offshore ascending section usually passes through layers with different properties.Because of the great difference in the mechanical properties of each layer,it is easy to cause stress concentration,which leads to the damage of the tunnel structure.In this paper,the submarine tunnel passing through the rising section of upper soft and lower hard stratum is taken as the research object.The numerical model is established by using a commercial finite element software ABAQUS.Dynamic time-history analysis and quasi-static analysis are used to study the seismic responses of tunnel structures passing through different stratum.In the dynamic time-history analysis,the tunnel models under three conditions of crossing upper soft and lower hard stratum,homogeneous rock stratum,and homogeneous stiff soil stratum were established respectively.The analysis shows that when the tunnel passes through the upper soft and lower hard stratum,the internal force is the largest and the deformation is not uniform.The internal force is the smallest when it passes through the homogeneous rock stratum.In quasi-static analysis,the tunnel response is calculated by applying 1D equivalent linear analysis to the soil.The analysis shows that the results obtained by the quasi-static analysis method are in good agreement with those obtained by the dynamic analysis method.But the quasi-static analysis method is more efficient and more convenient for the seismic response analysis of complex tunnel structures.

关 键 词：海底隧道 上软下硬地层 横向地震作用 动力时程分析 拟静力分析 

分 类 号：U45[建筑科学—桥梁与隧道工程]