【作者】 刘伟；

【导师】 李成辉；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 轨道过渡段是客运专线以及高速铁路线路中最薄弱的环节之一,由于强度、刚度、基础沉降等差异的存在必然会引起钢轨的垂向不规则变形,导致轮轨间不平顺的产生。为了保证高速铁路线路的高平顺性,必须对线路刚度有突变的地段进行过渡段的合理设置。本文在总结以往轨道过渡段模型的基础上,建立了有砟轨道和CRTSⅡ型板式无砟轨道过渡段的力学计算模型,通过分析静力作用下有砟—无砟轨道过渡段的垂向位移变形曲线形状,以及轮轨力和轨下基础反力大小的情况,来评价现行刚度过渡形式过渡段的力学性能,并进一步对其进行优化。本文通过建立的过渡段力学计算模型,分析评价了现行过渡段形式-刚度线性过渡在力学性能上的缺陷与不足；既而提出了相应的优化措施,对比分析了过渡段刚度线性过渡、正弦曲线过渡以及抛物线和三次多项式组合曲线过渡三种刚度过渡形式在力学性能上的优劣性,以寻求一种更加适用于高速铁路发展的过渡段刚度过渡形式。本文还利用所建立的力学计算模型,从轨道刚度比、过渡段长度、行车速度等敏感性影响因素出发,对高速铁路路基上有砟—无砟轨道过渡段的静、动力学性能进行了因素对比分析。本文的研究对于我国高速铁路过渡段的设计具有一定的参考价值。更多还原

【Abstract】 Transition Section is generally the weakest part of a high-speed railway. The existing differences of strength, stiffness as well as foundation settlement account for irregular deformations and consequently result in unevenness of railway line. To ensure the exact evenness of high-speed railway line, it is significantly necessary to appropriately set up Transition Section between areas that stiffness remarkably differs.Based on the generalization of previous models of Transition Section, this paper established computational models for the ballasted railway track and CRTSⅡslab ballastless railway track. Via analyses on different shapes of the deformation curves of different kinds of transition sections between ballasted railway area and ballastless railway track area under a certain static force, as well as the analyses on the magnitude of wheel-rail forces and foundation counterforces, this paper thereby evaluated the mechanical properties of transition sections with different transition forms, and finally optimized them.By means of the computational model established by the author, this paper analyzed the weakness and deficiency of the current transition forms—linear stiffness transition, and then proposed related methods for optimizing. By comparing the differences on mechanical properties of the three different transition forms:linear, sinusoidal as well as cubic polynomial stiffness transitions with each other, this paper endeavored to find a better and more suitable transition form for the ever-accelerated development high-speed railway.Finally, this paper also used this founded model to compare those sensitive factors such as Ratio of Track Stiffness, Transition Section Length and Running Speed with each other, according to the kinetic performance of ballasted—ballastless transition section of high-speed railway. Generally speaking, this paper is to some degree worthy of referring to about the transition section design for high-speed railway.更多还原