地铁运行引起的小半径曲线隧道周边地表动力响应分析  

Analysis of Ground Vibrations Induced by Metro Vehicles in Small Radius Curved Sections

作　　者：龚叶锋 GONG Yefeng(Shanghai Urban Construction Digital Industry Group Co.,Ltd.,Shanghai200082,China)

机构地区：[1]上海城建数字产业集团有限公司,上海200082

出　　处：《施工技术（中英文）》2024年第11期84-93,共10页Construction Technology

摘　　要：以某市地铁区间隧道工程为背景,开展地铁在小半径曲线隧道中运行诱发振动的现场实测,分析邻近区域地表振动的时频特性,并进行环境振动评价。在此基础上,采用ABAQUS有限元软件建立轨道-轨枕-道床-隧道-地基土体的三维有限元模型,计算地铁曲线段运行时诱发的地表振动,分析隧道埋深和列车运行速度对地表振动的影响规律。研究结果表明:地铁列车曲线段行驶产生的水平振动速度峰值是竖向振动速度峰值的1.5~2.0倍;水平振动主频率分布在10~20Hz和80~90Hz范围内,随着距离增加,高频部分衰减迅速。与直线隧道相比,地铁列车曲线段运行产生的地表水平振动响应大于直线隧道情况,而在竖直方向则相反。此外,随着隧道埋深的增加,地表各点水平振动速度峰值线性衰减,且隧道埋深对水平振动速度的影响大于对竖向振动的影响;隧道埋深对水平方向振动的主频率基本不产生影响。地表水平振动速度峰值与列车行驶速度大致呈抛物线关系;地表各点竖向振动速度峰值也随列车行驶速度增加而增大,但增大幅度小于水平振动;地铁列车行驶速度对其引发环境振动的频率影响显著,车速越大,环境振动主频越高。Based on the engineering background of the small radius curve section,the ground-surface vibrations characteristics induced by train are investigated by in-situ test.Time-history analysis,frequency spectrum analysis,Hilbert-Huang spectrum analysis,one-third octave band spectrum analysis are carried out for selected testing data.Moreover,a three-dimensional FE model of track-sleeper-ballast-tunnel-foundation is established by using ABAQUS software,to study the metro induced environmental vibrations.And the effects of the buried depth of tunnel,the operation velocity of metro on the ground vibrations are analyzed and discussed in detail.The results show that the peak value of horizontal vibration velocity is about 15~20 times of that of vertical vibration velocity.The dominant vibration frequency is in the range of 10~20Hz and 80~90Hz,and the high frequency part attenuates rapidly with the increase of the distance far from tunnel.Further,the horizontal vibration response induced by metro operating in the small radius curve section is greater than that in the case of straight tunnel,while the vibration response the vertical direction is diametrically opposite.In addition,the peak value of the nearby horizontal vibration velocity is generally linearly attenuated with the increase of the tunnel depth,and the influence of the buried depth of tunnel on the horizontal vibration velocity is greater than that of the vertical vibration.Further,the tunnel depth basically has no influence on the dominant frequency of the horizontal vibration.The relationship between the peak value of the horizontal vibration velocity and the train speed is roughly parabolic,and the peak value of the nearby vertical vibration velocity also increases with the increasing of the train speed,while the increase is less than that of the horizontal vibration.The speed of metro has a significant effect on the dominant frequency of environmental vibration,and the higher the speed is,the higher the dominant frequency is.

关 键 词：地铁 小半径曲线 地表振动 现场测试 数值模拟 

分 类 号：U231[交通运输工程—道路与铁道工程]