纵向轨枕式无砟轨道界面裂缝对轨道力学性能的影响  

The Influence of Cracks in Longitudinal Sleeper Ballastless Track Interface on Track Mechanical Performance

作　　者：刘志彬[1] 赵坪锐[1] 胡佳[1] 刘观[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2014年第10期47-50,61,共5页Railway Standard Design

基　　金：国家自然科学基金项目(51008258);中央高校基本科研业务费专项资金(SWJTU12CX065)

摘　　要：纵向轨枕轨道结构改用预制混凝土纵梁连续支撑的结构设计,故预制轨枕与道床板的新旧混凝土界面是结构稳定分析不可回避的因素。为了分析新旧混凝土界面对整体结构的影响,并为纵向轨枕式无砟轨道设计提供相关参考,通过建立纵向轨枕式无砟轨道的二维有限元计算模型进行研究。结果表明:纵向轨枕式无砟轨道在列车荷载和温度变化作用下,轨枕与道床板界面附近会出现纵向裂缝,并裂缝加快扩展。界面裂缝对轨道内部应力分布影响很大,对钢轨扭转有一定影响。The change of longitudinal sleeper track structure ballastless to precast concrete longitudinal continuous support structure has made the structural stability an inevitable factor to be analyzed in the interface between precast sleeper and track slab with new and old concretes. In order to analyze the impact in the interface with new and old concretes on the overall structure, and provide reference for the longitudinal sleeper ballastless track design, a two-dimensional finite element modeling longitudinal sleeper Ballastless model is established for research. The results show that, around the interface between sleeper and slab, cracks may appear under train load and the effect of temperature change and develop quickly. Cracks in interface have a considerable impact on internal stress distribution in the track, and also certain impact on rail twisting.

关 键 词：无砟轨道 新旧混凝土界面 纵向裂缝 钢轨扭转 

分 类 号：U213.244[交通运输工程—道路与铁道工程]