不同场地土条件下地铁引起的环境振动分析  

Analysis of Environmental Vibration due to Subway under Different Site Soil Conditions

作　　者：金峤[1] 张佳宇 孙丽[1] JIN Qiao;ZHANG Jiayu;SUN Li(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第4期627-635,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2018YFC1504303)。

摘　　要：目的研究城市地铁轨道交通引发周边场地振动的影响规律,从而为邻近建筑物的振动舒适度评价、振害分析以及减隔振措施的有效应用提供环境振动信息。方法基于ABAQUS建立“土层-隧道”有限元模型,计算考虑轨道不平顺因素的地铁列车动力荷载,采用VDLOAD子程序模拟列车的运行过程,进而对不同场地类别、不同列车速度及不同隧道轨道埋深等影响条件下,列车运行诱发的地面振动响应进行比较分析。结果水平向加速度峰值响应在距离地铁轨道中心20 m处达到最大值,随后在横向距离为20~40 m的区间内迅速衰减;垂直向加速度峰值响应的最大值出现在距离地铁轨道中心0 m处,并在横向距离20 m内迅速衰减至其1/10左右。结论场地效应的水平向加速度峰值响应呈现先增大后减小的“驼峰”趋势,而垂直向加速度峰值响应则呈现“单调递减”趋势;场地土类别对不同车速所引发的场地效应的差异性产生影响;场地振动效应总体上随隧道轨道埋深的增加而不断减小。In this paper,the influence law of vibration in surrounding sites caused by urban subway rail transit was studied,so as to provide environmental vibration information for the evaluation of vibration comfort of adjacent buildings,analysis of vibration damage,and effective application of vibration absorption and isolation measures.In order to investigate the vibration characteristics of the site surface,a finite element model of″soil-tunnel″based on ABAQUS was established,a dynamic load formula of subway trains considering track irregularities was constructed,and the VDLOAD subroutine was used to simulate train operation.And then the ground vibration responses induced by train operation under different site types,different train speeds,and different buried depth of tunnel track were analyzed and compared.It is found that the peak response of horizontal acceleration reaches the maximum value at around 20 meters from the center axis of the subway track,and then decayed rapidly in the region from 20 meters to 40 meters laterally.On the contrary,the maximum value of the vertical acceleration peak response appears at 0 meter from the center axis of the subway track,and rapidly attenuates to about one tenth of it within 20 meters from the transverse distance.It is concluded that the horizontal peak acceleration response of site vibration effects presents a″hump″trend of first increasing and then decreasing,while the vertical peak acceleration response presents a″monotonic decreasing″trend.And the site category has an impact on the difference of site effect caused by different vehicle speeds.Meanwhile,the vibration effect of the site generally decreases with the increase of the buried depth of the tunnel track.

关 键 词：地铁列车 场地效应 建筑场地类别 地面振动 

分 类 号：TU375[建筑科学—结构工程]