Sleeper End Resistance of Ballasted Railway Tracks
Sleeper End Resistance of Ballasted Railway Tracks
复制标题
DOI：
10.1061/(asce)gt.1943-5606.0001088
复制
发表时间：
2014-05-01
影响因子：
3.9
通讯作者：
Powrie, William
中科院分区：
文献类型：
--
作者：
Le Pen, Louis;Bhandari, Athma Ram;Powrie, William
本文描述了用于研究道床肩宽和高度对铁路枕木在一定肩宽和高度范围内的横向运动阻力的影响的模型试验。在试验过程中测量了挠度和阻力，并拍摄了照片。使用数字图像相关技术对照片进行了分析，以确定道床表面扰动的区域，这表明灯泡破坏体积在极限状态下被动员起来。提出了一种理想化的三维破坏机制，并用极限平衡法进行了抗力计算。该计算为测量的电阻提供了可靠的估计。这项工作确定了最佳的肩宽和肩高。扩展计算表明，当多个枕木同时移动时，每个枕木的枕端阻力可能比孤立枕木的试验结果少三分之一。图像分析和极限平衡计算表明，这是由相邻枕木的已动员故障体积重叠造成的。(C)2014年美国土木工程师学会。
This paper describes model tests used to investigate how ballast shoulder width and height contribute to a railway sleeper's resistance to lateral movement for a range of shoulder widths and heights. Deflection and resistance were measured and photographs taken during the tests. The photographs were analyzed using a digital image correlation technique to identify the zones of ballast surface disturbance, which demonstrated that a bulbed failure volume was mobilized at the ultimate limit state. An idealized three-dimensional failure mechanism is proposed, and resistances are calculated using the limit equilibrium approach. The calculation provides a reliable estimate of the measured resistance. The work identifies the optimum shoulder width and height. The calculations are extended to demonstrate that when a number of sleepers are moved simultaneously, the sleeper end resistance may be one-third less per sleeper than that indicated in tests on an isolated sleeper. Image analysis and limit equilibrium calculations show that this is caused by overlapping of mobilized failure volumes from adjacent sleepers. (C) 2014 American Society of Civil Engineers.