地铁列车振动荷载作用下近接隧道动力响应分析  

Research on Dynamic Response of Adjacent Tunnel under Vibration Load of Subway Train

作　　者：林峰[1] LIN Feng(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道勘察》2023年第3期149-154,共6页Railway Investigation and Surveying

基　　金：中铁第四勘察设计院集团有限公司科研项目(2021K075)。

摘　　要：地铁列车振动引起的动力响应是地铁营运期间的重点问题。为研究地铁列车振动荷载作用下近接隧道的动力响应,依托工程实例,以激振力函数法模拟列车振动荷载,利用FLAC3D软件建立隧道及周围土体三维数值模型,对近接隧道结构不同位置的振动加速度、应力、位移响应进行模拟分析。结果表明:(1)隧道底板的加速度响应大于顶板,左侧壁、中板和右侧壁,中部位置的测点加速度峰值最大;(2)隧道左侧壁和右侧壁上测点距底板距离越大,应力响应越小,而中板上测点的应力响应基本不随距离变化;(3)隧道底板上各测点竖向动位移均随时间不断增大,并且大致可分为3个阶段,随着底板上测点与地铁隧道的距离增加,其竖向动位移量呈线性减小。The dynamic response caused by subway train vibration is a key issue during subway operation.In order to study the dynamic response of the adjacent tunnel under the vibration load of the subway train,the vibration load of the train by the excitation force function method were stimulated based on the engineering example,and the three-dimensional numerical model of the tunnel and the surrounding soil was established by using FLAC3D software.The vibration acceleration,stress and displacement response of the proximity tunnel structure were studied at different locations.The results show that:(1)The acceleration response of the tunnel bottom plate is larger than that of the top plate,the left wall,middle plate and right wall,and the peak acceleration of the measurement point in the middle position is the largest;(2)The greater the distance between the measurement points on the left wall and right wall of the tunnel and the bottom plate,the smaller the stress response,while the stress response of the measurement points on the middle plate basically does not change with distance;(3)The vertical dynamic displacement of all positions on the tunnel bottom plate increases continuously with time,and can be roughly divided into three stages.With the distance between the measurement points on the bottom plate and the underpass tunnel increases,the amount of its vertical dynamic displacement decreases linearly.

关 键 词：地铁 振动荷载 近接隧道 动力响应 数值模拟 

分 类 号：U211.3[交通运输工程—道路与铁道工程] U231