摘要
[目的]对运营条件下的U型梁高架地铁线路的环境振动特点进行实测分析。[方法]以某市运营6年的U型梁高架地铁线路为研究对象,分析不同列车速度、不同曲线半径和不同减振措施对U型梁高架地铁线路的轨道振动和环境振动的影响。[结果及结论]当车速在70~90 km/h时,车速每增加10 km/h,地面振动源强处的最大Z振级VLZ,max约增加1.1~1.4 dB,符合环评导则的速度修正项建议值;线路从直线到半径800 m曲线,再到半径400 m曲线,地面源强处振动加速度级会增大3.7~4.1 dB,Z振级增加值略高于环评导则的线路修正项0.9~2.4 dB;减振扣件对8~200 Hz频段的地面振动均有影响,最大差值处的频率为50 Hz,振动加速度级降低约4.1 dB;梯形轨枕道床对4~200 Hz频段的地面振动均有影响,最大差值处的频率为31.5 Hz,振动加速度级降低约8.2 dB。长期运营条件下,梯形轨枕道床比减振扣件对地面源强处振动的降低效果好,影响频带宽。
[Objective]On-site measurement and analysis of the environmental vibration characteristics are conducted for the elevated metro lines with U-shaped beams under operating conditions.[Method]Taking an elevated metro line with U-shaped beams that has been in operation for 6 years in a certain city as the research object,the impacts of different train speeds,different curve radii and different vibration reduction measures on the track vibration and environmental vibration of the mentioned metro line are analyzed.[Result&Conclusion]When the train speed is between 70 and 90 km/h,for every 10 km/h increase in the train speed,the maximum Z vibration level VLZ,max at the ground strong vibration source increases by approximately 1.1 to 1.4 dB,which is in line with the recommended value of the speed correction term in the environmental impact assessment guidelines.When the line changes from straight to a 800 m radius curve and then to a 400 m one,the vibration acceleration level at the ground strong vibration source will increase by 3.7 to 4.1 dB,and the increase in the Z vibration level is slightly higher than the line correction term of 0.9 to 2.4 dB in the environmental impact assessment guidelines.The vibration reduction fasteners have an impact on the ground vibration in the frequency band from 8 to 200 Hz,the frequency at the location of the maximum difference is 50 Hz,and the vibration acceleration level is reduced by approximately 4.1 dB.The ladder-sleeper ballast bed has an impact on the ground vibration in the frequency band from 4 to 200 Hz,the frequency at the location of the maximum difference is 31.5 Hz,and the vibration acceleration level is reduced by approximately 8.2 dB.Under long-term operating conditions,the ladder-sleeper ballast bed has a better effect on reducing the vibration at the strong ground vibration source than the vibration reduction fasteners,with a wider affecting frequency band.
作者
牛晓莉
周宇
张宏亮
康锴
段玉振
李静敏
NIU Xiaoli;ZHOU Yu;ZHANG Hongliang;KANG Kai;DUAN Yuzhen;LI Jingmin(Qingdao Metro Group Co.,Ltd.,266035,Qingdao,China;The Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,201804,Shanghai,China;Beijing Urban Construction Design&Development Group Co.,Ltd.,100071,Beijing,China)
出处
《城市轨道交通研究》
北大核心
2025年第5期199-205,共7页
Urban Mass Transit
基金
山东省重大科技创新工程项目(2019JZZY010427)
青岛地铁集团有限公司项目(M8-ZX-2021-036)。
关键词
地铁
高架线路
U型梁
轨道减振
环境振动
metro
elevated line
U-shaped beam
track vibration reduction
environmental vibration
