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Maximum safe freight train speed on railway embankments under rapid drawdown conditions based on coupled stress-seepage slope stability analysis
Transportation Geotechnics ( IF 5.3 ) Pub Date : 2020-12-04 , DOI: 10.1016/j.trgeo.2020.100486
S. Xu , A.M. Zsáki

The rapid drawdown of the water level adjacent to a railway embankment can reduce its stability, which could compromise the safety of train movements. To investigate the effect drawdown on railway embankments as a function of train speed, a coupled finite element-based model was developed accounting for simultaneous deformations, stresses and seepage. To determine maximum safe train speeds, a comprehensive study was carried out that included slope parameters (e.g. railway embankment height, natural slope height, slope ratio), rapid drawdown ratios, and external freight train loads as a function of speed. The models used the shear strength reduction technique, in which the factor of safety for each model was obtained. Generally, steeper natural slopes with lower railway embankments built upon them are more prone to failure, thus severely limiting train movements when a drawdown condition occurs. However, for a large number of cases, mainly for flatter slopes, a safe passage can be achieved by limiting train speed, while tall railway embankments appear to be able to withstand drawdown conditions without a considerable reduction in train operating speeds. The results of findings are summarized in a table and it is hoped that the study will be useful to increase the safety of freight train operations, particularly in cases when there is a sudden change or an unusual event in the waterways adjacent to a railway embankment.



中文翻译:

基于耦合应力-渗流边坡稳定性分析的快速缩水条件下铁路路基最大安全货运速度

铁路路堤附近水位的迅速下降会降低其稳定性,从而可能危及列车运行的安全性。为了研究对铁路路堤的影响降落与列车速度的函数关系,建立了基于有限元耦合模型,同时考虑了变形,应力和渗流。为了确定最大安全列车速度,进行了一项综合研究,其中包括坡度参数(例如,铁路路堤高度,自然坡度,坡度比),快速下降比以及外部货运列车负荷随速度的变化。这些模型使用抗剪强度降低技术,从而获得每个模型的安全系数。一般来说,陡峭的自然坡道上建有较低的铁路路堤,因此更容易发生故障,因此,当出现降落状态时,将严重限制列车的运动。但是,在很多情况下,主要是在平缓的斜坡上,可以通过限制火车速度来实现安全通过,而高大的铁路路堤似乎能够承受降落条件而不会大幅降低火车的运行速度。结果汇总在表中,希望该研究对提高货运列车的运行安全性很有用,特别是在铁路路堤附近水道发生突然变化或异常事件的情况下。而高大的铁路路堤似乎能够承受降落条件,而不会大幅降低列车的运行速度。结果汇总在表中,希望该研究对提高货运列车的运行安全性很有用,特别是在铁路路堤附近水道发生突然变化或异常事件的情况下。而高大的铁路路堤似乎能够承受降落条件,而不会大幅降低列车的运行速度。结果汇总在表中,希望该研究对提高货运列车的运行安全性很有用,特别是在铁路路堤附近水道发生突然变化或异常事件的情况下。

更新日期:2020-12-14
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