Settlement of ballasted track under traffic loading: Application to transition zones
Settlement of ballasted track under traffic loading: Application to transition zones
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DOI：
10.1177/0954409712471610
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发表时间：
2014-03
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影响因子：
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通讯作者：
J. Varandas;P. Hölscher;M. Silva
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作者：
J. Varandas;P. Hölscher;M. Silva
与路堤上的铁路轨道到自然地面或无沉降结构的通道相对应的过渡区经常存在维护问题。轨道刚度的变化和不均匀沉降是过渡段轨道和基础退化的主要原因。本文提出了一种方法来预测由于列车荷载，适用于过渡区的轨道的沉降。该方法是基于使用（非线性）列车轨道相互作用模型和增量沉降模型的动态计算。铁路过渡动态模型中重要的非线性方面是轨枕和道碴之间的接触损失以及道碴的非线性本构行为。计算沉降时应注意对道碴长期性能影响最大的因素，如施加的动态力的幅度和加载循环次数。分析了列车动荷载和道床本构模型的重要性。
Transition zones corresponding to the passage from railway tracks on embankment to natural ground or settlement free structures are frequently problematic for maintenance. Changing stiffness of the track and differential settlements are the main causes for the degradation of tracks and foundations at transitions. This paper presents a methodology to predict the settlement of the track due to train loading, applicable to transition zones. The methodology is based on dynamic calculations using a (non-linear) train–track interaction model and an incremental settlement model. Important non-linear aspects in dynamic models for railway transitions are the loss of contact between the sleepers and the ballast and the non-linear constitutive behaviour of the ballast. The settlements are calculated paying attention to the factors that most influence the long-term behaviour of ballast, such as the amplitude of the applied dynamic force and the number of loading cycles. The importance of the dynamic loading from the trains and of the constitutive models used for the trackbed layers is analysed.