摘要
研究目的:下部基础中桥梁、路基和路桥过渡段对高速铁路无砟轨道结构性能有着重要的影响,因此分析不同下部基础对CRTSⅡ型板式无砟轨道内温度场分布的影响尤为关键。本文基于无砟轨道现场的半年温度监测数据,对比分析简支箱梁、路基和路桥过渡段三种基础上CRTSⅡ型板式无砟轨道内温度和温度梯度变化特征。研究结论:(1)半年内过渡段上无砟轨道内温度的非高斯性和非平稳性更显著,路基上非高斯性最差;四个特殊温度日,最高温度日的轨道内温度变化幅值最显著,而最大温差日的轨道内温度梯度变化幅值最大;(2)对于不同下部基础,过渡段轨道的温度变化和温度梯度变化最显著,其次是路基和桥上轨道的温度变化;(3)不同基础上轨道板的温度、路基土体的温度与环境温度呈明显的非线性关系,二次多项式拟合函数可表征轨道板内温度与环境温度的关系;桥上轨道的拟合优度R2为0.803,高于过渡段(0.752)和路基(0.635)上的;(4)本文研究可为高速铁路无砟轨道长期服役性能评估提供重要的温度实测数据。
Research purposes:Bridges,roadbeds,and transition sections are the main substructure for the high-speed railway ballastless tracks.It is important to study the influence of different substructures on the temperature distribution in the CRTSⅡslab ballastless track.Based on the field temperature monitoring data within half a year,the characteristics of the temperature and temperature gradient in the track slabs on three substructures(e.g.the simply supported box girder bridge,roadbed,the transition section between roadbed and bridge)are compared and analyzed in this paper.Research conclusions:(1)The temperature in track slab on transition section has the most remarkable feature of non-Gaussian and non-stationary in half a year,while the roadbed has the worst non-Gaussian feature.Within the four special temperature days,the variation of internal temperature in the maximum temperature day is the largest.However,the variation of temperature gradient in maximum temperature difference day has the greatest amplitude.(2)As for various types of substructure,the temperature difference and temperature gradient of the track slab on transition section have the most notably variation,followed by those temperature variation of the roadbed and the transition section.(3)The relationship among the internal temperature in track slab on different substructures,the temperature in soil body of roadbed,and the ambient temperature presents obvious nonlinear relationship,in which the quadratic polynomial fitting function is used to reflect the nonlinear relationship between the temperature in the track slab and ambient temperature.In addition,the fitting R2 of the track temperature on the bridge is 0.803,which is higher than that on the transition section(0.752)and the roadbed(0.635).(4)This research could provide important temperature measuring data of the service performance evaluation for the ballastless tracks in high-speed railway.
作者
周锐
袁文豪
朱星盛
刘翰林
杨怀志
王毅
ZHOU Rui;YUAN Wenhao;ZHU Xingsheng;LIU Hanlin;YANG Huaizhi;WANG Yi(Shenzhen University,Shenzhen,Guangdong 518060,China;Beijing-Shanghai High Speed Railway Co.Ltd,Beijing 100038,China;Jinan Railway Bureau Jinan West Engineering Section,Jinan,Shandong 250102,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2023年第1期13-20,61,共9页
Journal of Railway Engineering Society
基金
国家自然基金面上项目(52278311)
广东省自然基金面上项目(2022A1515010665,GJHZ20200731095802007)
中国国家铁路集团总公司科技研究开发计划(K2020G007)
高速铁路线路工程教育部重点实验室开放基金(2021)
高速铁路轨道技术国家重点实验室开放基金课题(2021YJ143)
关键词
CRTSⅡ型板式无砟轨道
下部基础
温度监测
非平稳
非高斯
温度相关性
CRTSⅡslab ballastless track
substructure
temperature monitoring
non-stationary
non-Gaussian
temperature correlation
