中低速磁浮快线产生地表振动的现场测试分析

发布时间：2018-04-10 03:31

  本文选题：中低速磁浮列车　切入点：地表振动　出处：《振动与冲击》2017年18期

【摘要】：为研究中低速磁浮引起地表振动特性。在国内首条运营的长沙中低速磁浮快线某路段进行现场地表振动测试,同时测试北京地铁13号线某高架线区段地表振动作为对照工况。测试结果表明:由于轨道受均布力,磁浮快线引起的地表振动波形没有明显的周期性峰值;磁浮线路,由于轮轨分离,车辆、轨道系统的特征距离所对应的特征频率不明显,桥梁动力特性较明显;由于轮轨分离、受轨道不平顺影响较小,30~80 Hz中低速磁浮存在明显优势地面振动,这部分振动主要来自导轨、轨道梁的结构振动以及线路不平顺;距线路0~40 m范围内地表振动的最大Z振级,中低速磁浮快线较传统地铁高架线对应距离至少小4 dB,且中低速磁浮快线引起地表振动在10~40 m范围内均满足《城市区域环境振动标准》中的振动限值要求。
[Abstract]:In order to study the characteristics of ground vibration caused by medium and low speed maglev.In a section of Changsha middle and low speed maglev fast line which is the first in operation in our country, the field surface vibration test is carried out, and the ground surface vibration of an elevated line section of Beijing Metro Line 13 is tested as a control condition.The test results show that the surface vibration waveform caused by the maglev fast line has no obvious periodic peak due to the uniform distribution of track, and the characteristic frequency corresponding to the characteristic distance of vehicle and track system is not obvious due to the separation of wheel and rail on the maglev line.The dynamic characteristics of the bridge are obvious, due to the separation of wheel and rail, there is obvious dominant ground vibration due to the influence of track irregularity and low speed maglev at 3080Hz, which mainly comes from the guideway, the structural vibration of the track beam and the irregularity of the track.The maximum Z level of surface vibration within 40 m from the line,The corresponding distance of the medium and low speed maglev fast line is at least 4 dB smaller than that of the traditional subway viaduct line, and the ground vibration caused by the medium and low speed maglev fast line can meet the vibration limit requirements of the Environmental Vibration Standard for Urban areas within a range of 10 ~ 40 m.
【作者单位】： 北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金(51508022;51408033;51608456)
【分类号】：TB53
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本文编号：1729492