武汉地铁7号线行车荷载下越江公铁两用隧道结构动力响应分析  

Structural Dynamics Response Analysis of Wuhan Metro Line 7 Rail-cum-Road Cross-river Tunnel under Metro Traffic Load

作　　者：崔豪[1,2] 刘晶 张志华[1,2] 黄金权 聂文婷[1,2] CUI Hao;LIU Jing;ZHANG Zhihua;HUANG Jinquan;NIE Wenting(Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,430010,Wuhan,China;不详)

机构地区：[1]长江水利委员会长江科学院,武汉430010 [2]水利部山洪地质灾害防治工程技术研究中心,武汉430010 [3]水利部科技推广中心,北京100038

出　　处：《城市轨道交通研究》2023年第3期19-23,29,共6页Urban Mass Transit

基　　金：国家自然科学基金项目(42077062);青年人才托举工程项目(2021QNRC001);湖北省自然科学基金项目(2021CFB129);中央级公益性科研院所基本科研业务费专项资金资助项目(CKSF2021446/TB)。

摘　　要：以武汉地铁7号线越江公铁两用隧道为研究对象,建立了考虑地铁行车荷载的越江隧道(含钢轨、轨枕、管片及周边岩土体等)离散元模型。在该隧道某截面上选取14个测点,分析了地铁行车荷载下该截面各层混凝土板的局部动力响应及管片动力响应。结果表明:管片结构及各混凝土板对称点处的颗粒振动加速度呈对称分布;随着地铁行车荷载的施加,排烟道两侧与管片连接处、公路路面板中心区域的剪应力逐渐增大,易出现裂隙破坏;地铁行车荷载引起的振动波在管片内的传递以横向振动波和竖向振动波为主;地铁列车开始通过隧道截面时对隧道管片的影响最大。Taking Wuhan Metro Line 7 rail-cum-road cross-river tunnel as research object,a discrete element model of cross-river tunnel under metro traffic load(including rail,sleeper,segment and surrounding soil)is established.14 measuring points are selected on a section of the tunnel,the local dynamics response and segment dynamics response of the concrete slabs in each layer of the section under metro traffic load are analyzed.Results show that the particle vibration accelerations at the symmetrical points of the segment structure and concrete slabs are symmetrically distributed;with the application of metro traffic load,the shear stress at the connection between both sides of smoke exhaust duct and segments and the central area of highway pavement slab increases gradually,which is prone to crack failure;the vibration wave caused by metro traffic load is mainly transmitted by transverse vibration wave and vertical vibration wave in the segment.The influence on the tunnel segment is the largest when the metro train starts to pass through the tunnel section.

关 键 词：地铁 越江公铁两用隧道 行车荷载 结构动力响应 离散元模型 

分 类 号：U451.3[建筑科学—桥梁与隧道工程] U459.5[交通运输工程—道路与铁道工程]