摘要
合理的线形设计、精准的线形调整是高速列车高平顺性运行的基础。为解决大跨度桥梁轨道线形受温度影响发生较大垂向变形而导致不宜实施平顺性调控的问题,结合我国五峰山长江大桥轨道线形实测数据,首先分析变坡点位置、坡段坡度和竖曲线半径随温度的变化规律。其次,提出温度每变化7℃需要设置一条基准线,该温度梯度内线形变化平缓,60 m高低不平顺相关性高。最后,提出基于基准线的组合弦调控方法,对10 m中点弦测值、30 m矢距差和60 m中点弦测值施加控制条件,并应用该方法制定五峰山长江大桥轨道线形调控方案。研究结果表明:五峰山长江大桥每7℃设置一条轨道基准线达到了以温度划分轨道线形类别的合理精度,相应基准线可为对应温度下±3.5℃范围内的实测线形提供平顺性调控依据。温度升高条件下,基准线的跨中变坡点里程始终稳定在K318+881,竖曲线半径由21600 m增大至29100 m,两侧坡段坡度逐渐降低,坡度代数差逐渐减小,整体线形发展趋势逐渐平缓。应用调控方案对五峰山长江大桥轨道线形进行模拟调整后,10 m中点弦测值、30 m矢距差和60 m中点弦测值改善率达到79%以上,列车运行安全性能改善率达到60%以上,可有效提升五峰山长江大桥运营期桥上线路平顺性。研究结果可为其他存在显著温度变形特征的大跨度桥上轨道线形调控提供参考。
Reasonable alignment design and precise adjustment are the foundation for smooth operation of high�speed trains.The track alignment of long-span bridges is affected by temperature and undergoes significant vertical deformation,which makes the implementation of smoothness regulation difficult.In combination with the measured data of the track alignment of Wufengshan Yangtze River Bridge,the slope change point,the slope gradient,and the vertical curve radius were analyzed as a function of temperature.It was proposed that a baseline should be set up every 7℃,and the alignment changes smoothly within this temperature range,with a high correlation between 60 m vertical irregularities.Finally,a combined chord control method based on the baseline was proposed,which imposes control conditions on the 10 m mid-chord offset,the 30 m vector distance difference and the 60 m mid-chord offset.The method was applied to develop a track alignment control plan for Wufengshan Yangtze River Bridge.The research results show that setting a track baseline every 7℃for Wufengshan Yangtze River Bridge achieves a reasonable accuracy for classifying track alignments based on temperature.The corresponding baseline can provide a basis for smoothness control of the measured alignment within the range of±3.5℃at the corresponding temperature.With increasing temperature,the mileage of the grade change point for the baseline remains stable at K318+881,the radius of the vertical curve increases from 21600 m to 29100 m,and the slope gradients of both sides decrease.The difference in the slope gradients gradually reduces,and the overall alignment trend gradually becomes smoother.After applying the control plan to adjust the track alignment of Wufengshan Yangtze River Bridge,the improvement rate of the 10 m mid-chord offset,the 30 m vector distance difference,and the 60 m mid-chord offset is over 79%,and the improvement rate of the train operation safety performance reaches over 60%.It effectively improves the track smoothness on Wufengshan Yangtze River Bridge during the operation period.The research results can provide a reference for other long-span bridges with significant temperature deformation characteristics.
作者
谭社会
张雨潇
周丽
时瑾
TAN Shehui;ZHANG Yuxiao;ZHOU Li;SHI Jin(China Railway Shanghai Group Co.,Ltd.,Shanghai 200071,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2024年第10期4076-4088,共13页
Journal of Railway Science and Engineering
基金
国家重点研发计划项目(2022YFB2602900)。
关键词
高速铁路
大跨度桥梁
空间线形
轨道精调
几何不平顺
high-speed railway
long-span bridge
spatial alignment
track adjustment
geometric irregularity
作者简介
通信作者:时瑾(1980—),男,甘肃临夏人,教授,博士,从事铁路线路工程技术研究,E−mail:jshi@bjtu.edu.cn。
