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为探明板结道床对轨道结构宏观质量状态及微观力学特性的影响，在铁路线隧道地段开展了宽轨枕轨道、Ⅲ型轨枕轨道的道床横向阻力和支承刚度现场试验，并建立了含脏污颗粒的宽轨枕轨道结构离散元模型。在此基础上，分析了脏污程度及板结深度对道床板结宏观质量状态、颗粒细观接触特性、轨道结构状态的影响规律。结果表明：宽轨枕轨道的横向阻力、支承刚度分别是Ⅲ型轨枕的2.54、1.96倍，可以增加宽轨枕抵抗横向变形的能力，但会加剧列车对道床的振动冲击作用，影响列车运行安全；宽轨枕垂向位移随板结深度的增大逐渐减小；脏污颗粒入侵道床会增大颗粒之间的咬合及摩擦关系，道砟颗粒间的接触力分布均匀，应力减小。
Abstract：In order to investigate the macroscopic quality status and microscopic mechanical characteristics of the track structure affected by the hardened ballast bed, field tests were conducted on the transverse resistance and support stiffness of the wide rail sleeper track and typeⅢ sleeper ballast bed in railway tunnel sections, and a discrete element model of the wide rail sleeper track structure containing dirt particles was established. On this basis, the change law of degree of dirt and the depth of hardening on the macroscopic quality state, particle microscopic contact characteristics, and track structure state of the track bed hardening was analyzed. The results show that the lateral resistance and support stiffness of the wide rail sleeper track are 2.54 and 1.96 times that of the type Ⅲ sleeper, respectively, which can increase the ability of the wide rail sleeper to resist lateral deformation but will exacerbate the vibration impact of the train on the ballast bed, affecting the safety of train operation. The vertical displacement of the wide rail sleeper gradually decreases with the increase of the hardening depth. The invasion of dirty particles into the ballast bed will increase the biting and friction relationship between particles, and the contact force distribution between ballast particles will be uniform, resulting in reduced stress.
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基本信息:
DOI：
中图分类号:U213.21
引用信息:
[1]谭阳,肖宏,闫东伟等.宽轨枕道床板结对轨道结构力学特性的影响[J].铁道建筑,2025,65(05):28-34.
基金信息:
中国铁建股份有限公司科研计划(2020-C06)