捣固稳定作业次数对新建铁路道床振动传递特性的影响

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (24) : 51-58.

论文

张智海1,2，肖宏1,2，王阳1,2，迟义浩1,2

作者信息 +

Effect of the times of tamping and stabling operations on vibration transmission characteristics of new railway ballast beds

ZHANG Zhihai1,2，XIAO Hong1,2，WANG Yang1,2，CHI Yihao1,2

Author information +

文章历史 +

摘要

新建铁路在开通运营前需进行多次捣固稳定作业以确保线路达到正常运营要求。但目前现场大机捣固稳定组合作业次数多以长期累积的实践经验为主，缺乏科学的理论依据。本文为研究DWL-48捣稳组合作业车对新建铁路道床动力特性的影响，开展了捣固稳定作业现场锤击试验，从时频域角度细致分析了不同捣固稳定作业条件下道床的振动传递特性。研究结果表明：随着捣固次数的增大，道床纵向振动衰减率R13（轨枕1传递至轨枕3）逐渐增大，而道床纵向振动衰减率R12（轨枕1传递至轨枕2）呈先减小后增大的变化趋势，且在第二次捣固作业时道床纵向振动衰减率出现最小值30.73%；捣固作业次数主要改变了离激振源最近轨枕的第一共振频率。随着捣固稳定作业次数的增加，离激振源最近轨枕的第一共振频率呈先增大后减小再增大的变化趋势，在第二次捣固稳定作业后，第一共振频率出现极小值118.125Hz。同一起道量条件下，仅考虑道床振动传递特性，建议新建铁路在进行多次捣固作业时应该将捣固次数控制在2次；综合考虑捣固稳定作业次数对道床纵向振动传递特性的影响，建议新建铁路应该进行2次捣固稳定作业较为合理。

Abstract

Newly-built railways need to conduct multiple tamping and stabilizing operations before opening operations to ensure that the routes meet the normal operation requirements. However, at present, the number of on-site large machine tamping and stabling combination operations is mainly based on long-term accumulated practical experience, lacking scientific theoretical basis. In this paper, in order to study the influence of DWL-48 tamping and stabilizing combined operation vehicle on the dynamic characteristics of new railway ballast bed, the hammering test of tamping and stabilizing operation site was carried out, and the vibration transmission characteristics of ballast bed under different tamping and stabilizing operation conditions were analyzed in detail from the perspective of time-frequency domain. The results show that with the increase of tamping times, the longitudinal vibration attenuation rate R13 (sleeper 1 transfer to sleeper 3) of ballast bed increases gradually, while the longitudinal vibration attenuation rate R12 (sleeper 1 transfer to sleeper 2) of ballast bed decreases first and then increases, and the longitudinal vibration attenuation rate of ballast bed reaches the minimum value of 30.73 % at the second tamping operation. The number of tamping operations mainly changes the first resonance frequency of the nearest sleeper from the excitation source. With the increase of the number of tamping stabling operations, the first resonance frequency of the sleeper closest to the excitation source increases first, then decreases and then increases. After the second tamping stable operation, the first resonance frequency has a minimum value of 118.125 Hz. Under the condition of the same track lifting volume, it is suggested that the number of tamping times should be controlled at 2 times when the new railway carries out multiple tamping operations. Considering the influence of the number of tamping stable operations on the longitudinal vibration transmission characteristics of the ballast bed, it is suggested that the new railway should carry out two tamping stabling operations.

导出引用

张智海1,2，肖宏1,2，王阳1,2，迟义浩1,2. 捣固稳定作业次数对新建铁路道床振动传递特性的影响[J]. 振动与冲击, 2023, 42(24): 51-58

ZHANG Zhihai1,2，XIAO Hong1,2，WANG Yang1,2，CHI Yihao1,2. Effect of the times of tamping and stabling operations on vibration transmission characteristics of new railway ballast beds[J]. Journal of Vibration and Shock, 2023, 42(24): 51-58

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