The influence of variation in track level and support system stiffness over longer lengths of track for track performance and vehicle track interaction
The influence of variation in track level and support system stiffness over longer lengths of track for track performance and vehicle track interaction
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DOI：
10.1080/00423114.2019.1677920
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发表时间：
2019-10
影响因子：
3.6
通讯作者：
D. Milne;J. Harkness;L. Le Pen;W. Powrie
中科院分区：
文献类型：
--
作者：
D. Milne;J. Harkness;L. Le Pen;W. Powrie
不均匀沉降和轨道几何不规则性的发展驱动了对有碴轨道的维护需求。预测这一点需要了解列车荷载和由此产生的应力如何变化，以及如何沿着轨道分布，以及轨道如何响应。来自空载水平的差异和载荷下的挠度（来自刚度和载荷的变化）的不平顺影响沿着轨道的轮轨接触力。刚度也将影响到地面中的应力分布。为了研究（空载）轨道水平和支撑系统刚度沿着铁路的变化，沿沿着200 m长的轨道进行了刚度、轨道挠度和轨枕水平调查。使用全站仪测量每个轨枕的轨道水平，使用加速度计计算挠度，并对轨道支撑系统刚度进行基于频率的分析。一个简单的二维车辆-轨道相互作用模型被用来研究的影响，卸载轨枕水平，在轨道刚度的变化和任何识别的空洞的轨道性能。在这里，卸载水平是更重要的加载水平和车轮/轨道接触力比轨道刚度的变化，这是最重要的负载下的挠度。
Differential settlement and development of track geometry irregularity drives the need for maintenance of ballasted railway tracks. Predicting this requires an understanding of how train loading and the resulting stresses vary and are distributed along the track and how the track responds. Irregularities, from differences in the unloaded level and deflection under load (from variation in stiffness and load) influence the wheel-rail contact force along the track. The stiffness will also influence the distribution of stress into the ground. To investigate variation in the (unloaded) track level and support system stiffness along a railway, stiffness, track deflection and sleeper level surveys were carried out along a 200 m length of track. Measurements were taken at every sleeper using total station for track level and accelerometers to calculate deflection, together with a frequency-based analysis for the track support system stiffness. A simple 2D vehicle track interaction model was used to study the influence of the unloaded sleeper level, the variation in track stiffness and any identified voiding for the performance of the track. Here, the unloaded level was more significant for the loaded level and the wheel / rail contact forces than the variation in track stiffness, which was most importance for the deflections under load.