竖向强震作用下密贴地铁地下交叉结构动力响应分析  

Dynamic response of closely-attached intersecting underground subway structures under vertical strong ground motion

作　　者：陶连金[1] 王文沛[1] 张波[1] 边金[2] 李文博[1] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]广东海洋大学工程学院,广东湛江524088

出　　处：《岩土工程学报》2012年第3期433-437,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家973项目(2007CB714203);国家自然科学基金项目(40972189);北京市自然科学科技基金重点项目(8111001);北京工业大学研究生科技基金项目(ykj-2011-6505)

摘　　要：研究密贴地铁地下交叉结构的地震反应特性,对地铁地下结构穿越工程的建设和安全运营有着重要的现实意义。利用FLAC3D有限差分程序对北京地区典型密贴地铁地下交叉结构进行了地震响应的数值模拟分析,研究了竖向强震作用下地铁区间隧道密贴下穿地铁车站结构体系的地震反应特性,并与单一地铁车站的地震反应特性进行了比较,研究表明:密贴地铁车站交叉主体结构由于车站—隧道结构间的相互作用,较单一地铁车站主体结构竖向位移及受力具有明显的增减,并与输入地震动的特性有关,且各监测部位增减幅值基本一致;由于土体对地震动高频成份的显著滤波作用,因此高频丰富的汶川卧龙波作用下地铁车站主体结构竖向相对位移差-时程及应力差-时程明显小于低频丰富的阪神波作用下地铁车站主体结构竖向相对位移差-时程及应力差-时程;地铁车站主体结构竖向相对位移差-时程及应力差-时程对于输入地震动的峰值加速度不太敏感。It is important for subway approaching excavation and safe management to study the seismic response characteristics of closely-attached intersecting underground subway structures.The finite difference procedure FLAC3D is used to simulate the seismic response of typical closely-attached intersecting underground subway structures under vertical strong ground motion in Beijing,of which the seismic response characteristics are analyzed carefully and compared with those of a single subway station as well.It is shown that there are significant changes in the vertical displacement and the stress of structures between the single subway station and the closely-attached intersecting subway station because of the strong interaction of the upper station and the lower tunnel,which is also in connection with input ground motion,and that the monitoring parts have the same variation amplitudes.As soils can filter high frequency component of ground motion significantly,the vertical displacement difference and the vertical stress difference between the above two kinds of subway stations under vertical strong ground motion rich in high-frequency waves are smaller than those rich in low-frequency waves,while they are not sensitive to peak acceleration of input ground motion.

关 键 词：密贴地铁地下交叉结构 竖向强震 FLAC3D有限差分程序 地震反应特性 

分 类 号：TU435[建筑科学—岩土工程]