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Field investigation into the vibration characteristics at the embankment of ballastless tracks induced by high-speed trains in frozen regions
Soil Dynamics and Earthquake Engineering ( IF 4.2 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.soildyn.2020.106387
Shuang Tian , Liang Tang , Xianzhang Ling , Yangsheng Ye , Shanzhen Li , Yingjie Zhang , Wei Wang

Abstract Rapid growth and implementation of high-speed trains (HSTs) have made commuting easier. However, the vibrations induced by HSTs deteriorate the embankment of ballastless tracks, particularly of those constructed in frozen regions. In this study, a series of field tests are conducted on the Harbin–Dalian high-speed railway in frozen regions to investigate the vertical acceleration (Az) at the embankment in terms of the train speed (v) and distance from the track centreline (d). The characteristics of Az in the time and frequency domains are analysed based on the field test results. The results show that Az under the unfrozen condition is greater than that in the frozen condition. The periodic excitation of the HSTs can be identified from the time histories of Az within the range of 13.2 m from the track centreline. Moreover, the frequencies of Az can be characterized by v and geometrical characteristics of the train, regardless of seasonal variations. The peak vertical acceleration (Ap,z) and frequency-weighted vertical acceleration level (Laz) are investigated with respect to v and d. In the unfrozen and frozen conditions, Ap,z and Laz decrease in the form of a power function with increasing d. The higher the v value, the higher the Ap,z value. The dynamic impact coefficient of embankment is introduced to identify the Az performance. Some useful recommendations are provided, and the results can be used for validating numerical predictions related to HST-induced vibration.

中文翻译:

冰冻地区高速列车诱发无砟轨道路堤振动特性的现场研究

摘要 高速列车 (HST) 的快速增长和实施使通勤变得更加容易。然而,HST 引起的振动会破坏无砟轨道的路堤,尤其是在冰冻地区建造的轨道。本研究对哈大高速铁路在冰冻地区进行了一系列现场试验,以列车速度(v)和距轨道中心线的距离为研究对象,研究路堤处的垂直加速度(Az)。 d)。根据现场测试结果分析了Az在时域和频域的特性。结果表明,未冻结条件下的Az大于冻结条件下的Az。HST 的周期性激发可以从距轨道中心线 13.2 m 范围内的 Az 时间历程中识别出来。而且,Az 的频率可以通过 v 和列车的几何特征来表征,而与季节变化无关。研究了相对于 v 和 d 的峰值垂直加速度 (Ap,z) 和频率加权垂直加速度水平 (Laz)。在解冻和冻结条件下,Ap,z 和Laz 以幂函数的形式随着d 的增加而减小。v 值越高,Ap,z 值越高。引入路堤动力冲击系数来识别Az性能。提供了一些有用的建议,结果可用于验证与 HST 引起的振动相关的数值预测。z) 和频率加权垂直加速度水平 (Laz) 就 v 和 d 进行研究。在解冻和冻结条件下,Ap,z 和Laz 以幂函数的形式随着d 的增加而减小。v 值越高,Ap,z 值越高。引入路堤动力冲击系数来识别Az性能。提供了一些有用的建议,结果可用于验证与 HST 引起的振动相关的数值预测。z) 和频率加权垂直加速度水平 (Laz) 就 v 和 d 进行研究。在解冻和冻结条件下,Ap,z 和Laz 以幂函数的形式随着d 的增加而减小。v 值越高,Ap,z 值越高。引入路堤动力冲击系数来识别Az性能。提供了一些有用的建议,结果可用于验证与 HST 引起的振动相关的数值预测。
更新日期:2020-12-01
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