基于气象资料的无砟轨道瞬态温度场特性研究  

Study on Transient Temperature Field Characteristics of Ballastless Track Based on Meteorological Data

作　　者：曹世豪[1] 邓非凡[1] 赵春光[1] 苏成光 赵坪锐[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,四川成都610031

出　　处：《铁道建筑》2016年第5期28-33,共6页Railway Engineering

基　　金：国家重点基础研究发展计划(973计划)(2013CB036202);国家自然科学基金(U1434208);中国铁路总公司科技研究开发计划(Z2013G001;2014G001-A)

摘　　要：针对无砟轨道瞬态温度场分布问题,基于气象学和热力学原理,建立无砟轨道三维瞬态温度场计算模型,并对成都地区CRTSⅠ型双块式无砟轨道温度场进行分析。结果表明:无砟轨道温度场是由大气温度、太阳辐射、风荷载等因素综合决定的,白天太阳辐射起主导作用,轨道呈正温度梯度,夜间大气温度起主导作用,轨道呈负温度梯度;风荷载通过改变对流换热系数从而影响轨道温度场,具有白天降低正温度梯度,夜间增加负温度梯度的作用,且夜间的作用更明显;随着深度的增加,轨道温度变化幅值逐渐减小,温度极值出现时间逐渐滞后,且温度呈非线性分布特性。开展无砟轨道温度场试验,对轨道温度进行实时监测,试验测试结果与理论计算结果基本一致。According to transient temperature field distribution of ballastless track,the 3D transient temperature field calculation model of ballastless track was established and the temperature field of CRTS Ⅰ double-block ballastless track in Chengdu region was analyzed based on the meteorology and thermodynamic principle.The results show that the temperature field of ballastless track is determined synthetically by the free air temperature,solar radiation,and wind load,the solar radiation plays a leading role during the daytime and the track has a positive temperature gradient,the free air temperature plays a leading role during the nighttime and the track has a negative temperature gradient,wind load changes the convection heat transfer coefficient in order to affect the track temperature field,which reduces positive temperature gradient in the daytime and enhances negative temperature gradient in the nighttime more obviously,the temperature variation amplitude decreases and the temperature extremum lags gradually with the increase of depth,and the temperature has non-linear distribution characteristic.The ballastless track temperature field test was performed for real time monitoring of track temperature,and the test results are basically consistent with the theoretical calculation results.

关 键 词：无砟轨道 温度场 太阳辐射 大气温度 风荷载 

分 类 号：U213.244[交通运输工程—道路与铁道工程]