轨道减振措施对高架线车致环境振动影响分析
杨林房斌牛晓莉袁德浩
Effect Analysis of Track Vibration Reduction Measures on Viaduct Environmental Vibration Induced by Vehicle Operation
YANG LinFANG BinNIU XiaoliYUAN Dehao
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作者信息:青岛地铁集团有限公司，266035，青岛
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Affiliation:Qingdao Metro Group Co., Ltd., 266035, Qingdao, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.12.013
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中图分类号/CLCN:U231.94
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栏目/Col:学术专论
摘要:
［目的］列车在高架桥轨道运行时，由车辆-轨道相互作用引起的钢轨振动会通过轨道结构传递至桥梁、桥墩、桩基础，进而引发桥梁周围的地面振动。因此，有必要对高架段轨下减振和道床减振对高架轨道交通环境振动的影响进行研究。［方法］基于车辆-轨道多体动力学理论和有限元方法，建立车辆-轨道-U型梁桥-土体振动模型，求解轨道交通车辆经过时高架桥附近地面源强的振动响应。［结果及结论］高架段地面源强处的垂向振动频率峰值频段分布在40~60Hz。减振扣件、梯形轨枕、减振垫浮置板及钢弹簧浮置板均对地面源强振动有降低效果，其贡献主要体现在振动频率为25~100Hz范围。采用减振扣件、梯形轨枕、减振垫浮置板和钢弹簧浮置板条件下，当振动频率为40~50Hz时，地面源强振动加速度级分别降低了约4.2~4.4dB、6.5~6.9dB、7.8~8.1dB和10.0~10.7dB。当扣件刚度≤15kN/mm时，钢轨垂向位移和垂向加速度峰值明显增大。当扣件刚度由60kN/mm减小至10kN/mm时，钢轨垂向位移和垂向加速度峰值分别增加了约5倍和18.26%，在振动频率为40~50Hz的峰值频段，地面源强处的垂向振动加速度级降低了约4.5~4.9dB。
Abstracts:
［Objective］ When a train running on the viaduct track, the rail vibration caused by the vehicle-track interaction will be transmitted to the bridge, piers, and pile foundations through the track structure, thereby triggering ground vibration around the bridge. Therefore, it is necessary to study the impact of elevated section rail and track bed vibration reduction on the environment for elevated rail transit. ［Method］ Based on the vehicle-track multi-body dynamics theory and the finite element method, a vehicle-track-U beam bridge-soil vibration model is established to solve the vibration response of the ground source intensity near the viaduct when rail transit vehicles passing through. ［Result & Conclusion］ The peak frequency band of the ground source intensity vertical vibration frequency for elevated section is distributed in 40 ~ 60 Hz. Vibration-damping fasteners, trapezoidal sleepers, vibration-damping pad floating plates and steel spring floating plates all have a reduction effect on the ground source intensity vibration, and their contribution is mainly reflected in the vibration frequency range of 25 ~ 100 Hz. Under the conditions of using vibration-damping fasteners, trapezoidal sleepers, vibration-damping pad floating plates, and steel spring floating plates, when the vibration frequency is 40 ~ 50 Hz, the ground source intensity vibration acceleration levels are reduced by about 4.2 ~ 4.4 dB, 6.5 ~ 6.9 dB, 7.8 ~ 8.1 dB and 10.0~10.7 dB respectively. When the fastener stiffness is ≤15 kN/mm, the rail vertical displacement and vertical acceleration peak value increase significantly. When the fastener stiffness decreases from 60 kN/mm to 10 kN/mm, the rail vertical displacement and acceleration peak value increase by about 5 times and 18.26% respectively. In the peak frequency band of 40 ~ 50 Hz, the vertical vibration acceleration level at the ground source intensity decreases by about 4.5 ~ 4.9 dB.
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