拉日铁路沿线气温轨温观测研究  

Observation and Research on Air Temperature and Rail Temperature Along Lhasa-Shigatse Railway

作　　者：管新武[1] GUAN Xinwu(Shaanxi Railway and Underground Traffic Engineering Key Laboratory,China Railway First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司陕西省铁道及地下交通工程重点实验室,西安710043

出　　处：《铁道建筑》2022年第6期53-57,共5页Railway Engineering

基　　金：中铁第一勘察设计院科技开发计划项目(院科19-01)。

摘　　要：针对青藏高原地区日温差大、气温变化剧烈的特点,基于现场测试对拉日铁路沿线气温轨温进行观测分析,研究沿线气温轨温变化规律及极端值分布区间。结果表明:拉日铁路沿线年气温轨温条件呈现低纬度、高海拔气候特征,有利于铺设无缝线路,锁定轨温设计相对容易;青藏高原地区气温轨温的关系超出了现行规范规定,最低轨温应取最低气温减5℃,最高轨温一般地段可维持现行规范,但在日照充分、通风不良的路堑地段,应取最高气温加25℃;高原地区年极端温差较小,检算可满足铺设跨区间无缝线路的要求,但应慎重铺设跨区间无缝线路。In view of the large daily temperature difference and severe temperature changes in the plateau area,based on field tests,the air temperature and rail temperature along the Lhasa-Shigatse Railway were observed and analyzed,the air temperature and rail temperature variation rules and extreme value distribution intervals along the line were studied.The results indicate that:The annual temperature and rail temperature conditions are which showing lowlatitude and high-altitude climatic characteristics,which conducive to the laying of CWR and stress-free rail temperature design relatively freely;the relationship between air temperature and rail temperature in the Qinghai-Tibet Plateau area exceeds the current standards.The lowest rail temperature should be taken as the lowest temperature minus 5℃,and the highest rail temperature in general areas can maintain the current standards.However,the highest temperature plus 25℃should be used in the cutting areas where with sufficient sunshine and poor ventilation.The annual extreme temperature difference in plateau areas is small,the check and computation can meet the requirements of laying CWR with welded turnout,but CWR with welded turnout should be laid carefully.

关 键 词：拉日铁路 气温轨温 观测研究 青藏高原 无缝线路 

分 类 号：U212.33[交通运输工程—道路与铁道工程]