轨道过渡段动、静刚度过渡研究  

Research on Transition Between Dynamic and Static Stiffness in Track Transition Section

作　　者：亓伟 尹明 QI Wei;YIN Ming(Chengdu Vocational&Technical College of Industry,Chengdu 610218,China)

机构地区：[1]成都工业职业技术学院,成都610218

出　　处：《成都航空职业技术学院学报》2020年第1期46-49,共4页Journal of Chengdu Aeronautic Polytechnic

摘　　要：有砟-无砟轨道过渡段因刚度差异存在振动特性加剧、轮轨系统破坏加剧的问题。在动荷载的作用下,两种轨道结构的振动特性存在差异,需要合理设置过渡段保证轨道动、静刚度的过渡。因轨道是多层结构,各层刚度变化对轨道动、静刚度均有影响,故本文建立有砟-无砟轨道多层结构的力学模型分析其影响,得出:轨道静刚度过渡可以通过调整轨道某层结构刚度或多层结构刚度共同调整等措施实现,轨道动刚度过渡则需轨下各结构层共同调整实现;本文给出的有砟-无砟轨道刚度过渡措施为,多层分段过渡措施--无砟轨道扣件刚度提高至60kN/mm、靠近无砟轨道段扣件40kN/mm+道床刚度提高10倍、靠近有砟轨道段扣件50kN/mm+道床刚度提高10倍的综合过渡措施。The stiffness difference in the transition section between ballasted track and ballastless track may give rise to problems of intensified vibration and increased damage to wheel-rail system. Under dynamic load of train wheel, the vibration characteristics of the two track structures are different. As a result, it is necessary to set up a reasonable transition section to ensure the transition between dynamic and static stiffness of the track. Since the track is a multi-layer structure, the stiffness change of each layer has an impact on the dynamic and static stiffness of the track. A multi-layer mechanical model of ballasted-ballastless track was established in this paper. The analysis of the impact comes to the following conclusions: the transition of track static stiffness can be achieved by adjusting the stiffness of one layer or multiple layers of track structure;the transition of track dynamic stiffness needs to be accomplished by adjusting jointly the structural parameters of each layer under the track. It is suggested in this paper that the optimal stiffness transition measure of ballasted-ballastless track should be sectional multi-layer transition. Namely, the fastener stiffness of ballastless track is increased to 60 kN/mm. The original 40 kN/mm+ track bed stiffness close to ballastless track section fasteners is increased by 10 times. The original 50 kN/mm+ track bed stiffness close to ballasted track section fasteners is increased by 10 times.

关 键 词：有砟轨道 无砟轨道 动刚度 轨道过渡段 振动特性 

分 类 号：U213.212[交通运输工程—道路与铁道工程]