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.
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. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(24): 51-58.
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