摘要
地铁盾构隧道整体道床轨道脱空已成为影响地铁安全运营的重要因素。为揭示整体道床局部脱空对于车轨振动性能的影响,基于车辆-轨道耦合动力学理论,建立了地铁列车-整体道床轨道-隧道衬砌-地基二维垂向耦合模型,运用模态分析法和Newmark法求解并分析了不同脱空长度和列车速度下的地铁车轨振动响应。研究结果表明:地铁隧道整体道床局部脱空对车体、转向架、轮对等部位的加速度响应影响显著;车体竖向加速度、钢轨位移和道床位移等振动幅值随脱空长度的增长而增大,可作为道床脱空监测的敏感振动指标,且随着地铁运行速度的增加,车体竖向加速度幅值的增长速度显著加大。
The monolithic track bed disengagement of the metro shield tunnel has become an important factor af-fecting the safe operation of the metro lines.In order to reveal the influence of the local disengagement of the mono-lithic track bed on the vibration performance of the train-track system,based on the train-track coupling dynamics theory,a two-dimensional vertical coupled model of the metro train-monolithic track bed-tunnel lining-foundation system is established.The dynamic responses of the train-track system are calculated by using modal analysis meth-od and Newmark method.The responses of the train-track system under different disengaging lengths and train speeds are analyzed.The results show that the monolithic track bed disengagement of the metro tunnel has a signifi-cant impact on the acceleration response of the carriage,bogie,wheelset,and so on.The vibration amplitudes of the carriage vertical acceleration,the rail displacement,the track bed displacement increase accordingly with the increase of the disengaging length,which can be used as sensitive vibration indicators for the monitoring of the track bed disengagement.With the increase of train speed,the growth rate of the carriage acceleration amplitude in-creases significantly.
作者
蒋吉清
章亦然
董北北
陈春来
魏纲
丁亮
JIANG Jiqing;ZHANG Yiran;DONG Beibei;CHEN Chunlai;WEI Gang;DING Liang(Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第3期149-156,共8页
Journal of Natural Disasters
基金
国家自然科学基金项目(51778576)
杭州市科技计划项目(20191203B40)。
关键词
地铁隧道
整体道床
局部脱空
车轨振动
敏感振动
metro tunnel
monolithic track bed
local disengagement
train-track vibration
sensitive vibration
