地铁常用减振轨道振动特性及减振效果对比研究

Comparative Study on Vibration Characteristics and Vibration⁃reducing Effects of Metro General Vibration⁃reducing Tracks

对中等减振扣件轨道、梯形轨枕轨道、钢弹簧浮置板轨道、普通整体道床轨道进行环境振动现场实测,对比分析地铁列车通过时不同轨道的钢轨、道床、隧道壁振动加速度(垂向、横向)及钢轨动态变形(垂向、横向).结果表明:4种类型轨道的钢轨振动加速度相差不大;中等减振扣件轨道的道床振动加速度小于普通整体道床轨道,另外2种减振轨道明显大于普通整体道床轨道;钢弹簧浮置板轨道的隧道壁振动加速度明显小于其他轨道;钢弹簧浮置板轨道减振效果最好;中等减振扣件轨道的钢轨动态变形明显大于其他轨道.

The environmental vibration of medium vibration-damping fastener track,trapezoid sleeper track,steel spring floating slab track and common monolithic track was measured on site,and the vibration acceleration(vertical and horizontal)and dynamic deformation of rail(vertical and horizontal)for the track,track bed and tunnel wall were compared and analyzed when the subway train passes through different tracks.The results show that there are little difference among the rail vibration acceleration of the four types of tracks,the vibration acceleration of the track bed with medium vibration-damping fastener is less than that of common monolithic track bed,and vibration acceleration of the other two kinds of vibration-damping tracks are significantly greater than that of the common monolithic track bed,the tunnel wall vibration acceleration of steel spring floating slab track is obviously smaller than that of other three types of tracks,the steel spring floating slab track has the best vibration reduction effect,and the rail dynamic deformation of medium vibration-damping fastener track is obviously larger than that of other tracks.