橡胶混凝土道床动力特性的足尺试验分析

Full-scale experiment on dynamic characteristics of tunnel invert using rubberized concrete

随着大量地铁线路的开通运营,轨道振动问题日益受到关注。该研究针对橡胶混凝土道床,构建足尺试验平台。通过动力试验,对2%橡胶混凝土道床和普通混凝土道床进行频谱、振动加速度级、传递损失、插入损失、分频振级均方根差值等评价指标分析,得出以下结论:(1)橡胶混凝土道床的减振频段主要为1-63 Hz低频段;(2)1-200 Hz频段,采用橡胶混凝土道床的传递损失普遍大于普通混凝土道床;(3)1-100 Hz频段,采用橡胶混凝土道床的隧道壁插入损失普遍为正值;(4)对比橡胶混凝土道床和普通混凝土道床,隧道壁测点的分频振级均方根差值约1.9 dB。该研究为橡胶混凝土道床在地铁中应用提供了试验数据支撑。

With the opening and operation of a large number of subway lines,the problem of railway vibration has been paid more and more attention.In this paper,a full-scale platform of tunnel invert is constructed.Through the vibration experiment,vibration acceleration spectrum,vibration acceleration level,transfer loss,insertion loss were analyzed.Results show that:(1)the vibration reduction frequency of rubberized concrete is mainly in 1-63 Hz;(2)in 1-200 Hz,the transfer loss of rubberized concrete is generally greater than that of traditional concrete;(3)in 1-100 Hz,the insertion loss of rubberized concrete is generally positive;(4)compared rubberized concrete and traditional concrete,the difference of mean square root of vibration level at the tunnel wall is about 1.9 dB.This paper provides experimental data for the application of rubberized concrete in subway.