隧道纵向地震反应分析的整体式反应位移法  

INTEGRAL RESPONSE DISPLACEMENT METHOD FOR LONGITUDINAL SEISMIC RESPONSE ANALYSIS OF TUNNEL STRUCTURE

作　　者：刘晶波[1] 王东洋[1] 谭辉[1] 宝鑫[1] 王文晖[1] LIU Jing-bo;WANG Dong-yang;TAN Hui;BAO Xin;WANG Wen-hui(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2018年第10期17-26,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51478247);国家自然科学基金重大研究计划集成项目(91215301);国家973项目(2011CB013602)

摘　　要：对于非一致地震动作用下隧道纵向地震反应问题,采用地下结构横断面地震反应的整体式反应位移法的基本原理,给出了一种根据自由场地震反应确定隧道纵向反应最不利变形和最不利内力发生时刻,即最不利时刻的确定方法,提出了适用于地下隧道结构纵向地震反应分析的整体式反应位移法。该方法通过自由场静力分析模型,根据隧道埋深位置处的自由场最不利变形确定等效地震作用,通过隧道结构-地基整体模型的静力计算获得隧道结构的最不利地震反应。以北京某地铁区间盾构隧道结构为研究对象,分别采用纵向整体式反应位移法和动力时程分析方法进行了出平面剪切波入射下隧道结构纵向地震反应计算,并将二者的计算结果进行了对比与分析。结果表明,该文提出的纵向整体式反应位移法概念明确、过程简便,具有良好的计算精度,可用于非一致地震动输入下隧道等长线型地下结构的抗震分析。In view of the fundamental theory of integral response displacement method employed in lateral seismic analysis of underground structure,a kind of method that can be adopted to analyze the longitudinal seismic response of a tunnel structure is put forward.Based on the seismic response of the free field,a way to determine critical moments when longitudinal maximal deformation and internal force of a tunnel structure occurred is proposed as well.When employing this method,a static free-field analysis model is built first,and then the least favorable free-field deformation corresponding to the buried depth of the tunnel structure is treated as an equivalent seismic action.Then the critical seismic response of the tunnel structure can be achieved by calculating the integral tunnel-foundation model statically.Taking a certain shield tunnel structure in Beijing as the research object,the proposed method and accurate dynamic time-history analysis method were adopted respectively to obtain the longitudinal seismic response of the tunnel under SH wave incidence.The calculation results indicate that the proposed method has clear concept,simple process and high accuracy.Therefore,this suggested method can be introduced to seismic response analysis of linear underground structures under asynchronous seismic action.

关 键 词：隧道结构 非一致地震动输入 纵向地震反应 最不利时刻 整体式反应位移法 出平面剪切波 

分 类 号：U452.38[建筑科学—桥梁与隧道工程]