洛阳地铁隧道-地面振动传递率实测研究

Study on tunnel-ground vibration transmissibility measurement and engineering prediction of luoyang metro line 1

为研究洛阳地铁某区间地铁隧道-地表的振动传递规律,对地铁列车运行时引起的隧道、地面振动进行了现场同步实测。对比两种车速下的地铁振动源强,车速从69 km/h降至35 km/h时隧道壁振动降低了4.0 dB。两种车速下的功率谱密度振动传递率模型吻合良好,可用于地铁振动传递规律的定量预测。在此基础上,将轨道普通扣件更换为双层非线性扣件进行地面振动预测,更换为双层非线性扣件后地面振动为70.3 dB,相比普通扣件降低了3.1 dB,预测结果可为降低地铁引起的地面振动提供设计参考。

In order to study the vibration transfer laws between subway tunnel and ground in a certain section of Luoyang Metro,the on-site synchronous measurement of the tunnel and ground vibration caused by subway trains was carried out.Comparing the vibration source intensity at two train speeds,the tunnel wall vibration is reduced by 4.0 dB when the train speed is reduced from 69 km/h to 35 km/h.The power spectral density vibration transmissibility models at the two vehicle speeds are in good agreement and can be used for quantitative prediction of subway vibration transmission laws.On this basis,the ground vibration prediction was performed by replacing the common rail fasteners with double nonlinear fasteners.The ground vibration after replacing with double nonlinear fasteners was 70.3 dB,which was 3.3 dB lower than that of common fasteners.Prediction results can provide design reference for reducing ground vibration caused by subway.