钢弹簧浮置板轨道减振效果现场与实验室测评研究

Field and Laboratory Test Research on the Vibration Reduction Effect of Steel Spring Floating Slab Track

摘要: 为研究分析钢弹簧浮置板轨道减振特性，现场对比测试隧道壁和基础位置的振动特性和减振效果，通过电磁式激振器施加冲击激励对实验室基础位置插入损失进行测评研究，并结合现场测试规律进一步估算出隧道壁位置减振效果。研究表明：振动从基础传至隧道壁后大幅衰减，普通整体道床轨道最大Z振级衰减11.2 dB，钢弹簧浮置板轨道最大Z振级衰减20.0 dB；测点位置和车次对钢弹簧浮置板轨道减振效果评价具有较大影响；实验室测评钢弹簧浮置板轨道在6.3 Hz~12.5 Hz不具有减振效果，在16 Hz以上频段减振效果较好；基础位置的减振效果为7.5 dB，估算隧道壁位置Z振级插入损失为16 dB左右。

Abstract: In order to study and analyze the vibration reduction characteristics of steel spring floating slab tracks in field and laboratory evaluations, the vibration characteristics and vibration reduction effects of tunnel walls and base positions were compared and tested on site. The insertion loss at the base position in the laboratory was evaluated by applying impact excitation through an electromagnetic vibrator, and the vibration reduction effect at the tunnel wall position was further estimated based on on-site testing patterns. The results show that the vibration attenuates significantly from the base to the tunnel wall, with a maximum Z-vibration level attenuation of 11.2 dB for ordinary tracks and 20.0 dB for steel spring floating slab tracks. The train number and measurement point position have a significant impact on the evaluation of the vibration reduction effect of the steel spring floating plate track. The laboratory evaluation shows that the steel spring floating slab track does not have vibration reduction effect between 6.3 Hz and 12.5 Hz, but has better vibration reduction effect in the frequency band above 16 Hz. The vibration reduction effect at the base position is 7.5 dB, and the estimated Z-vibration level insertion loss at the tunnel wall position is about 16 dB.