时速80 km/h地铁地下线梯形轨枕轨道现场测试分析

为评价时速80 km/h地铁作用下梯形轨枕的工作性能,对北京地铁某线梯形轨枕道床进行现场动位移和加速度测试,从时域、频域和Z振级角度对加速度指标进行分析,从时域角度对动位移数据进行分析,评价梯形轨枕轨道工作性能。结果表明:地铁列车作用下普通道床钢轨、道床和隧道壁振动有效值为14.1、0.48、0.069 m/s~2,梯形轨枕断面对应测点振动有效值为18.1、0.62、0.016 m/s~2,隧道壁处振动加速度在1～1 000 Hz内均有一定减振效果,最大Z振级差值为11.9 dB,梯形轨枕道床钢轨垂向、钢轨横向、梯轨垂向、梯轨横向最大动位移分别为0.34、0.13、1.21、0.081 mm。

Test and analysis of Ladder Sleeper Ballast in Subway with Speed of 80km/h Metro

In order to evaluate the working performance of the metro ladder sleeper ballast under the action of 80km/h metro, the dynamic displacement and acceleration of ladder sleeper ballast on a line of Beijing Metro were measured. The acceleration index is analyzed from the perspectives of time domain, frequency domain and Z vibration level, and the dynamic displacement data are analyzed by time domain to evaluate the performance of the metro ladder sleeper track. The results indicated that: under the action of subway trains, the vibration effective values of ordinary ballast rail, tunnel bed and tunnel wall are 14.1, 0.48, 0.069 m/s2, and the corresponding vibration effective values of ladder sleeper ballast section are 18.1, 0.62, 0.016 m/s2, the tunnel wall in vibration acceleration within 1-1000 hz have certain vibration reduction effect, maximum Z vibration differential value of 11.9 dB, trapezoidal sleeper track rail vertical, lateral, vertical ladder rail, rail track horizontal maximum dynamic displacement are: 0.34, 0.13, 1.21, 0.081 mm.