地铁隧道内不同轨道结构振动测试与分析

通过对地铁隧道内普通整体道床、Ⅲ型轨道减振器、弹性短轨枕、梯形轨枕、钢弹簧浮置板道床的现场振动测试，进行时、频域对比，了解各种减振措施在不同频率范围内的减振效果差异。结果表明，轨道减振器、梯形轨枕、弹性短轨枕及钢弹簧浮置板可分别降低隧道壁VLZmax分别为4 dB，7.6 dB，7.8 dB，19.0 dB；无论何种轨道减振措施，高频减振效果高于低频减振效果， Z计权的振动加速度级明显小于不计权的振动加速度级减振效果；梯形轨枕、弹性短轨枕、轨道减振器对50 Hz以上振动减振效果明显，钢弹簧浮置板道床对12.5 Hz以上振动减振效果明显，对控制列车运行产生的二次噪声更有效。

Test and analysis on vibration of different track structures in tunnel

In order to meet the environment vibration requirements of building which is sensitive to vibration, four different measures of track vibration mitigation are adopted. The difference of various vibration mitigation measures in different frequency domain is known by comparing on-site vibration test results in the time domain and frequency domain, including Ⅲ style rail vibration absorber, flexible short sleeper, ladder sleeper and steel spring floating slab track in underground circular shield tunnel. The results show that: (1) Four measures can respectively reduce degree of Z direction vibration is 4 dB, 7.6 dB,.8 dB, 19.0 dB at tunnel wall. (2) High frequency mitigating vibration effect is higher than low frequency, and the weighted vibration acceleration level is significantly lower than the non-weighted. (3) spring floating slab track have obvious mitigating vibration effect above 12.5 Hz. Flexible short sleeper, ladder sleeper, and rail vibration absorber have obvious mitigating vibration effect above 50 Hz.