地震作用下软土隧道的易损性分析  

The Longitudinal Seismic Analysis of Immersed Tunnel Considering Spatial Variability of Earthquakes

作　　者：陈之毅[1,2] 曹光晔 CHEN Zhiyi;CAO Guangye(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200082,China;Department of Underground Structure and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《结构工程师》2018年第A01期130-137,共8页Structural Engineers

基　　金：国家自然科学基金资助项目(41472246)

摘　　要：近年来研究表明,地震动空间变异性对于长大结构的地震响应具有很大的影响。本文通过动力时程分析法,以港珠澳沉管隧道为背景,研究了行波效应以及相干效应对沉管隧道纵向动力响应的影响。研究发现,考虑地震动空间变异性将会导致沉管隧道在地震作用下的轴力、弯矩以及GINA止水带的变形量有很大的增加。此外,考虑行波效应时,采用不同的行波波速会对沉管隧道的地震响应造成一定的影响,随着行波波速的增大,沉管隧道的动力响应先增大后减小。在考虑相干效应时,采用的相干模型的相干性强弱会对结果有很大的影响,相干性越弱,沉管隧道在地震作用下的轴力、弯矩以及GINA的变形量越大,反之,则越小。Recent studies have shown that the spatial variability of earthquakes has great influence on the seismic response of long and large structures.Based on a large-scale immersed tunnel engineering in China,the Hong Kong-Zhuhai-Macao immersed tunnel,this paper will focus on the longitudinal seismic response of immersed tunnel considering wave passage effect and coherence effect by employing dynamic time-history method.The result shows that the axial force、bending moment and deformation of GINA of immersed tunnel under earthquake will increase with the spatial variability of earthquakes considered.In addition,when wave passage effect is considered,the difference of traveling wave velocity will have certain influence on the dynamic response of immersed tunnel.And with the increase of the traveling wave velocity,the response of immersed tunnel will increase first and decrease then.When coherence effect is considered,the level of the coherence model used has great influence on the response of immersed tunnel.The lower of the level of coherence,the bigger the axial force、bending moment and deformation of GINA will be.Otherwise,these will be smaller.

关 键 词：地震动空间变异性 行波效应 相干效应 沉管隧道 

分 类 号：TU352.11[建筑科学—结构工程]