BALLAST AND SUBGRADE RESPONSE TO TRAIN LOADS
BALLAST AND SUBGRADE RESPONSE TO TRAIN LOADS
复制标题
道碴和路基对列车负载的响应
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
A. Sluz
中科院分区：
文献类型：
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作者：
E. Selig;A. Sluz
道碴和路基在轨道结构的维修寿命中起着重要作用，因为它们是与路面和线路劣化相关的累积永久变形的来源。道碴也是纠正这种由交通和环境因素造成的恶化的主要手段。为了更合理地进行轨道设计和维修计划，还需要更好的方法来预测控制参数对轨道性能的影响。本白皮书的目的是为了更好地了解这些问题，并描述在解决这些问题方面取得的进展。简要讨论了道床和路基的作用，阐述了永久变形的机理。介绍了新开发或改进的道床现场物理状态测量方法，并给出了现场试验结果的实例。对现有轨道结构解析模型预测轨道劣化的能力进行了评估。介绍了一种用于测量道床和路基的动应变和永久应变及变形的新仪器技术。最后，结合分析和试验研究结果，分析了道床和路基的应力、应变和变形特征。
Ballast and subgrade play major roles in the maintenance life of track structures because they are the source of the cumulative permanent deformation associated with the deterioration of surface and line. Ballast is also the principal means of correcting for this deterioration, which is caused by traffic and environmental factors. Better methods are still needed for the prediction of the effects of the controlling parameters on track performance for more rational track design and maintenance planning. The purpose of this paper is to provide a better understanding of these problems and describe progress being made toward their solution. The functions of ballast and subgrade are briefly discussed, and the mechanisms of permanent deformation are described. Newly developed or improved methods to measure the in situ physical state of ballast are presented, and examples of results from field tests are given. The capabilities of existing analytical track structure models for the prediction of track deterioration are assessed. New instrumentation techniques used for measuring the dynamic and permanent strains and deformations in ballast and subgrade are described. Finally, the characteristics of the stress, strain, and deformation in ballast and subgrade are illustrated with results of both analytical and experimental studies.