Influence of Train Speed and its Mitigation Measures in the Short- and Long-term Performance of a Ballastless Transition Zone

列车速度对无砟轨道过渡区短期和长期性能的影响及其纾缓措施

Ana Ramos, Rui Calcada & Antonio Gomes Correia

安娜·瑞默斯；鲁伊·卡尔卡达；安东尼奥·戈麦斯·科雷亚

Abstract：The ballastless track is nowadays the most popular railway system due to the required low number of maintenance operations and costs, despite the high investment. The gradual change from ballasted to ballastless tracks has been occurring in Asia, but also in Europe, increasing the number of transition zones. The transition zones are a special area of the railway networks where there is an accelerated process of track degradation, which is a major concern of the railway infrastructure managers. Thus, the accurate prediction of the short- and long-term performance of ballastless tracks in transition zones is an important topic in the current paradigm of building/rehabilitating high-speed lines. This work purposes the development of an advanced 3D model to study the global performance of a ballastless track in an embankment–tunnel transition zone considering the influence of the train speed (220, 360, 500, and 600 km/h). Moreover, a mitigation measure is also adopted to reduce the stress and displacements levels of the track in the transition. A resilient mat placed in the tunnel and embankment aims to soften the transition. The behaviour of the track with the resilient mat is evaluated considering the influence of the train speed, with special attention regarding the critical speed. The used methodology is a novel and hybrid approach that allows including short-term and long-term performance, through the development of a powerful 3D model combined with the implementation of a calibrated empirical permanent deformation model.

无砟轨道无疑是目前最受欢迎的轨道系统，尽管造价高，但维护保养次数少、价格低。在亚洲，有砟轨道已逐步转变为无砟轨道，欧洲亦如此，因此过渡区的数量有所增加。过渡区是铁路网中的一个特殊区域，加速了轨道退化，这也是铁路基础设施管理者主要关注的问题。因此，准确预测无砟轨道过渡区短期和长期性能表现是目前建设/修复高速线路范式中的一个重要课题。本研究旨在研发出一种先进的三维模型，在列车速度（分别为220、360、500、600km/h时）的影响下，探究无砟轨道在路堤——隧道过渡区的整体性能。此外，研究还采取措施来纾解轨道在过渡区的应力和位移问题。隧道和路堤处铺设了弹性垫来缓冲过渡。在列车速度尤其是临界速度的影响下，对铺设了弹性垫的轨道进行评估。采用新颖、综合的研究方法，通过开发强大的三维模型和应用经校准的实验永久变形模型，本研究囊括了无砟轨道在过渡区的短期及长期性能表现。

Keywords: ballastless track; train speed; transition zone; critical speed

关键词：无砟轨道；列车速度；过渡区；临界速度

来源：Railway Engineering Science

https://link.springer.com/article/10.1007/s40534-023-00314-4

发表时间：2023-07-23

检索：肖明昊

翻译：翟雅婷

一审：蒲婷

二审：彭莉

三审： 罗玲娟

上传发布： 姜浩