地铁钢弹簧浮置板轨道振动特性和减振效果研究

In order to study the Vibration reduction characteristics of the steel spring floating slab track, the Vibration acceleration of the rail and tunnel wall is tested and analyzed when a metro vehicle is passing through the track in a city of China. The Vibration characteristics and Vibration reduction effects of the track are compared with those of general non-damping track, vibration-damping fastener track and track with rubber Vibration isolation päd. The results show that when a vehicle passes the steel spring floating slab track, the Vibration acceleration value of the rail and the tunnel wall decreases by 21% and 89% respectively compared with the general non-damping track. The steel spring floating slab track, the track with rubber Vibration isolation päd and the general non-damping track rails have similar significant Vibration frequency bands of 400 ~ 550 Hz and 650 ~ 780 Hz. For the damping fastener track, the significant Vibration frequency bands are 340 ~ 440 Hz and 650 ~ 740 Hz. The frequency-divided Vibration level of the tunnel wall of the four tracks reach the maximum at 50 ~ 63 Hz. Compared with the general non-damping track, the maximum amount of Vibration reduction of the steel spring floating slab track, the track with rubber Vibration isolation päd and the track with vibration-damping fastener are 17. 3 dB, 15. 1 dB and 6. 1 dB respectively in the ränge of 4~200 Hz. Therefore, the Vibration reduction effect of the steel spring floating slab track is more prominent than other tracks.