【作者】 马俊；

【导师】 王星华； 任文峰；

【作者基本信息】 中南大学 ， 建筑与土木工程， 2013， 硕士

【摘要】 重载铁路日益成为我国铁路货运的发展方向,随着其速度和轴重的提高,其对轨下基础的要求也相应提高,尤其是对不同轨道形式过渡的区段,即过渡段的要求较一般区段更为严格。故而必须采取合理的过渡段处理措施借以保证轨道良好的运行。本文的项目背景是湖南柘溪水电站过坝滑道轨道改造工程,该工程中有一子工程是不同形式轨道间过渡段的设计,该轨道系统长期处于超重载--轴重57.5t的作用下,轨道结构破坏十分严重,尤其是不同轨道结构过渡段部分更是明显,这也是单独设计和研究过渡段轨道处理措施的必要性。该过渡段分为两个部分：钢架转盘与平台轨道的过渡段和位于基岩上整体轨道与位于近十余米厚填渣上的普通轨道间的过渡段,分别提出了橡胶桥梁钢板组合结构和梯形轨枕两种处理措施。本文首先基于理论分析,得到：橡胶桥梁钢板组合结构的影响因素是：橡胶厚度和弹性模量；梯形轨枕的影响因素是轴重、荷载速度和道床刚度。对于橡胶桥梁钢板组合结构,利用ABAQUS建立二维瞬态荷载作用下分析模型,结果表明：橡胶取30mm,弹性模量取20MPa是合适的。对于梯形轨枕,利用ABAQUS建立三维动态分析模型,结果表明：轴重和轨枕厚度对其静动荷载下的响应的影响最为明显,相关评价指标变幅明显；而且两种处理措施均能够满足实际工程不同工况下对轨道结构的要求。本文提出的两种处理措施都有实际的利用价值,均可以直接运用于实际重载铁路工程中：组合结构可以应用于重载铁路路桥(涵)过渡段刚度较大一侧的轨道下,借以缓解轮轨之间的冲击作用；梯形轨枕可用在重载铁路路桥(涵)过渡段刚度较小一侧,借以减小不同轨道结构形式之间的刚度差,提高轨道沿线的平顺性。更多还原

【Abstract】 Heavy haul railway has increasingly become the development direction of rail freight in China, with the improvement of the speed and axle load, it improves the foundation under the rail accordingly, especially to the section that transition between different orbital forms, that is the requirements for the transition section is more strict then the general section. Therefore a reasonable transition period treatment measures must be taken to ensure good running track.This paper is based on the subprojects of Hunan province zhexi station cross-dam the slide rail renovation project--the processing and designing transition section of overloading sideways passing the dam. Because the rail system is long-term in overweight loads, the damage of the track structure is serious; especially the part of the different track structure transition section is even more evident.The processing and designing transition section is divided into two parts:one alleviates the impact of overweight on the whole track bed of concrete; the other is non-ballasted-ballasts transitional stiffness apart enough to cause significant settlement.So that, this paper proposes two measures:one is composite structures of rubber and bridge steel plate;the other is ladder track.Based on the related theory, this paper gets the influencing parameters, makes the numerical simulation analysis for the two treatment measures using the finite element software ABAQUS, which analyze the impact on its performance made by the factors such as the axle load, speed and stiffness. The results show that:it’s reasonable that the rubber in the composite structures the thickness is30mm and the elasticity modulus is20MPa; the axle load and thickness of ladder track is the most obvious affected its static and dynamic loading response, related evaluation index significantly amplitude of variation, what’s more, both types of treatment measures can meet the actual engineering requirements for track structure under different working conditions.The two measures in this paper are realistic use value, they are can be used in heavy haul railway:the composite structures can be applied to the larger stiffness section of railway railroad-bridge (culverts) in heavy haul railway road, so as to alleviates the impact of wheel on rail; the ladder track can be applied to the small stiffness section of railway railroad-bridge (culverts) in heavy haul railway road, so as to reduce the difference between the stiffness in the form of different track structure and improve the riding comfort along the track.更多还原