摘要
桥上护轨对无缝线路稳定性的影响较为复杂,当轨道结构产生缺陷时(道砟缺失、轨枕空吊、扣件失能)会影响无缝线路的稳定性。为了研究桥上轨道结构缺陷对无缝线路稳定性的影响,通过有限元仿真软件,建立铺设护轨的桥上无缝线路有限元模型,研究轨道结构缺陷与无缝线路稳定性之间的关系。研究结果表明:挡砟板破损、轨枕空吊和扣件失能等单一缺陷条件下,均会导致允许升温幅度降低,无缝线路稳定性下降;其在同种工况下,轨枕空吊对应的临界温升幅度略大于扣件失能对应的临界温升幅度;复合缺陷情况下,当扣件失能数量超过2个以后,若扣件失能组数多于轨枕失能根数,则允许升温幅度与轨枕失能根数无关。研究为桥上无缝线路的养护和维修提供理论依据,有助于保证无缝线路服役安全。
The stability of seamless track with guard rails on bridge is intricately affected by various structural defects,such as damage ballast-retaining plates,voided sleepers,or failed fasteners.To clarify the relationship between these defects and the stability of the seamless line,a finite element model incorporating guard rails was developed.The results indicate that,under single-defect conditions,such as damage ballast-retaining plates,voided sleepers,or failed fasteners,the allowable temperature rise decreases,leading to a reduction in track stability.Furthermore,when comparing voided sleeper conditions with fastener failures under equivalent scenarios,the critical temperature rise for voided sleepers is slightly higher than that for failed fasteners.In cases involving combined defects,once the number of failed fasteners exceeds two,if the number of failed fasteners surpasses that of voided sleepers,the allowable temperature rise becomes independent of the number of voided sleepers.This study provides a theoretical basis for the maintenance and repair of seamless lines on bridges,ensuring the safe operation of the track system.
作者
赵隆隆
ZHAO Longlong(Hebei Construction Investment Transportation Investment Co.,Ltd.,Shijiazhuang 050001,China)
出处
《国防交通工程与技术》
2025年第1期31-35,共5页
Traffic Engineering and Technology for National Defence
关键词
桥上无缝线路
轨道结构
有限元
缺陷特征
允许升温幅度
seamless line on bridge
track structure
finite element
defect characteristics
allowable temperature rise
