Improving the performance of railway tracks through ballast interventions
Improving the performance of railway tracks through ballast interventions
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DOI：
10.1177/0954409716671545
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发表时间：
2018-02
期刊：
影响因子：
--
通讯作者：
T. Abadi;L. Pen;A. Zervos;W. Powrie
中科院分区：
文献类型：
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作者：
T. Abadi;L. Pen;A. Zervos;W. Powrie
有碴轨道的维护和最终更新构成了铁路网的主要运营成本。因此，更坚固的轨道设计具有更长的使用寿命和更少的维护要求，将带来显着的好处。本文介绍了实验室研究的结果，并探讨了通过改进道碴级配和减小道碴肩坡度来实现这一目标的潜力。循环载荷测试是在南安普敦铁路测试设施中的一段轨道上进行的，该轨道代表平面应变下的一个枕木间隔。代表 20 吨轴荷的循环荷载以 3 Hz 的频率施加至少 300 万个循环，在此期间进行永久和弹性垂直偏转的测量。某些干预措施被发现会导致永久定居率降低和不同的弹性迁移范围。使用补充测量来确定纵向压力、道碴破损和磨损以及路肩斜坡运动，以探索所观察到的道床性能改善的机制。结论是，使用更细的道碴坡度和更浅的路肩坡度有可能减少维护需求。
Maintenance and eventual renewal of a ballasted track constitute major operational costs for a railway network. Thus, significant benefits would accrue from a more robust track design having a longer service life and reduced maintenance requirements. This paper presents the results from a laboratory study and explores the potential to achieve this through improving the ballast grading and reducing the ballast shoulder slope. Cyclic loading tests were carried out on a section of track representing one sleeper bay in plane strain, in the Southampton Railway Testing Facility. A cyclic load representing a 20 tonne axle load was applied at 3 Hz for at least 3 million cycles, during which measurements of permanent and resilient vertical deflection were made. Certain interventions are found to result in lower rates of permanent settlement and different resilient ranges of movement. Supplementary measurements to determine longitudinal pressure, ballast breakage and attrition, and shoulder slope movement were used to explore the mechanisms responsible for the observed improvements in ballast bed performance. It is concluded that the use of finer ballast gradings and a shallower shoulder slope have the potential to reduce maintenance requirements.