高速铁路无砟轨道路基结构荷载传递规律研究

周颖,陈瑾

铁道工程学报 ›› 2016, Vol. 33 ›› Issue (5) : 18-24.

PDF(1127 KB)
PDF(1127 KB)
铁道工程学报 ›› 2016, Vol. 33 ›› Issue (5) : 18-24.
地质与路基

高速铁路无砟轨道路基结构荷载传递规律研究

  • 周颖,陈瑾
作者信息 +

Research on the Load Transfer Rule in Ballastless Track Subgrade System of High - speed Railway

  • ZHOU Ying,CHEN Jin
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文章历史 +

摘要

研究目的:路基作为高速铁路无砟轨道结构的基础,承受列车通过扣件和轨道系统自上而下传来的荷 载,扣件分配的荷载大小直接影响着路基内部应力水平。因此,本文通过建立高速铁路无砟轨道路基结构有 限元模型,对扣件的荷载分配以及路基内部的应力变化进行研究。 研究结论:通过对高速铁路无砟轨道路基结构研究得出:( 1)当单轮轴荷载作用于无砟轨道扣件点位置 时,荷载主要由7个扣件分配,不同扣件间距和刚度对作用点荷载分配比率影响较大;(2)双轮轴荷载其中一 轮轴作用在无砟轨道扣件点位置时,荷载主要由11个扣件分配;( 3)距离路基表面距离越远,应力衰减越慢, 当应力传递至路基底层时,不同轴重下的路基应力几乎接近;(4)该研究成果可为我国高速铁路无砟轨道路 基结构设计提供参考依据。

Abstract

Research purposes : As the basis of the Fallastless track structure of the high - speed railway,the subgrade is subjected to the train loads transferred from the fasteners and the track system. The internal stress level of the subgrade is directly influenced by the loads distributed by the fasteners. Therefore, the finite element model for the ballastless track subgradesystem of thehigh - speed railway was established to investigatetheload distribution of thefasteners and the variation of tlie subgrade internal stress. Research conclusions : Regarding the ballastless track subgrade structure of the high - speed railway,the following conclusions can be drawn : (1) When the single wheel axle load is acting on the fastener point of the ballastless track system,the load is mainly distributed by 7 fasteners. The load distribution is greatly affected by the space and the stiffness of the fasteners. (2) As for tlie two wheel system,if one of tlie wheel axle loads is acting on the fastener point of the ballastless track system,the load is mainly distributed by 11 fasteners. (3) The stress attenuation is slower with the further distance from the subgrade surface. When stress is transferred to the bottom of the subgrade,the subgrade stresses become very close with different axle loads. (4) This research results could provide references for t!ie design of the baiastless track subgrade system of thie high - speed railway in China.

关键词

高速铁路 / 无砟轨道 / 路基 / 数值模拟 / 荷载分配

Key words

high - speed railway / ballastless track / subgrade / numerical simulation / load distribution

引用本文

导出引用
周颖, 陈瑾. 高速铁路无砟轨道路基结构荷载传递规律研究[J]. 铁道工程学报, 2016, 33(5): 18-24
ZHOU Ying, CHEN Jin. Research on the Load Transfer Rule in Ballastless Track Subgrade System of High - speed Railway[J]. Journal of Railway Engineering Society, 2016, 33(5): 18-24

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