动荷载下越江隧道结构与周边土体动力响应研究  

Dynamic Response Analysis of Structure and Surrounding Soil of a Cross-river Tunnel Under Dynamic Load

作　　者：张志华 喻志强[1] 黄金权[1] 邓灵敏 ZHANG Zhihua;YU Zhiqiang;HUANG Jinquan;DENG Lingmin(Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan 430010,China)

机构地区：[1]长江水利委员会长江科学院,武汉430010

出　　处：《交通科技》2020年第5期92-95,100,共5页Transportation Science & Technology

摘　　要：以武汉市地铁2号线越江隧道为工程案列,建立二维离散元数值模型,以轨道、衬砌及周边岩土体为研究对象,从细观角度分析地铁运行对越江隧道稳定性的影响。研究表明,轨道的竖向位移随着列车速度的增大而减小;在衬砌内对称分布的颗粒体其竖向加速度波形线走势及振幅基本相同,衬砌整体变形以轨道中心线呈对称分布;隧道在拱顶处变形量最大,大位移颗粒区域范围达到2.36 m,隧道周边岩土体变形呈“锥形”分布。A two-dimensional cross-river tunnel model is conducted using Wuhan Metro 2nd Line as the case study.This model is proposed based on the discrete element method(DEM).In the present model,rail,sleeper,concrete lining and the surroundings have been studied to evaluate the influence of metro train operation on the stability of cross-river tunnel through micro-approaches.The results show that the vertical displacement of rail decreases with the increase of train speed;vertical acceleration curves and vibration amplitudes of particles which are at the symmetric positions have great consistency,and the whole deformation of the lining distributes symmetrically along the track center line;particles at the vault of the tunnel have the largest deformation and its distance is up to 2.36 m,and the deformation of the rock and soil surroundings around the tunnel forms“taper”shape.

关 键 词：越江隧道 离散元 地铁行车荷载 振动加速度 位移 

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]