苏州轨交1号线隧道内振动传递测试与分析

在苏州轨道交通1号线滨河路至塔园路上行隧道内，采用锤击法分别测试短轨枕断面（III型减振器扣件+短轨枕式整体道床）和长轨枕断面（普通扣件+长轨枕式整体道床）钢轨上激励点至钢轨、轨枕、道床以及隧道侧壁的振动传递。测试结果表明，扣件对于钢轨振动的衰减主要体现在小于100 Hz的低频段，而轨枕对频率大于100 Hz的振动有相对好的衰减效果。对比两个断面中钢轨测点至道床的传递函数，III型减振器扣件+短轨枕式整体道床具有更好的减振效果，在40 Hz～80 Hz频段的振动峰值衰减10 dB左右。

Measurement and Analysis of Vibration Transfer in the Tunnel of Suzhou No. 1 Metro

In order to study the effect of different damping measures of Suzhou No. 1 Metro, hammering method is used to test the function of vibration transfer from the excitation point of the rail to the rail, sleeper, ballast bed and tunnel’s sidewall of the short sleeper section （type III shock absorber fastener and short sleeper monolithic roadbed） and the long sleeper section （plain fastener and long sleeper monolithic roadbed）. The results show that, the rail vibration attenuation effect of the fasteners is mainly reflected in the low frequency range below 100 Hz, while the sleeper has good damping effect in the frequency range above 100 Hz. Comparing the vibration transfer functions of the two test sections, it is found that type III shock absorber fastener and elastic short sleeper monolithic roadbed have better damping effect than the other in the particularly concerned frequency range of 40 Hz-80 Hz, and the peak vibration value can be reduced by 10 dB.