摘要
基于环境监测资料和热力学基础理论,建立CRTSⅠ型板式无砟轨道三维瞬态温度场模型,分析哈尔滨地区冬季极端低温气象条件下无砟轨道温度场分布规律和影响因素,确定东北严寒地区无砟轨道性能分析的温度参数。结果表明:无砟轨道温度场分布的影响因素包括极端气温、轨道板吸收率、风速等;无砟轨道内温度变化滞后于环境温度,轨道板板顶及板边的日温度变化幅度较大;沿轨道板板顶向下,温度场呈非线性变化,温度波动幅值不断缩小;轨道板吸收率越大,则板顶温度及温度梯度越高;风速越大,板顶温度越低,轨道板内正温度梯度越小,负温度梯度越大;建议东北极端低温条件下轨道板的温度参数取正温度梯度75℃/m,负温度梯度-25℃/m。
Based on the environmental monitoring data and the basic theory of thermodynamics,a three-dimensional transient temperature field model of CRTSⅠslab ballastless track was established to analyze the distribution laws and influencing factors of the temperature field of ballastless track under the extreme low temperature meteorological conditions in winter in Harbin,and determine the temperature parameters for the performance analysis of ballastless track in the northeast cold region.The results show that the influence factors of temperature field distribution of ballastless track include extreme temperature,absorptivity of track slab,wind speed,etc.The temperature change in the ballastless track lags behind the ambient temperature,and the daily temperature change at the top and edge of the track slab is large.Along the top of the track slab,the temperature field changes nonlinearly and the amplitude of temperature fluctuation decreases continuously.The higher the absorptivity of the track slab,the higher the top temperature and temperature gradient will be.The higher the wind speed is,the lower the top temperature will be;the lower positive temperature gradient in the track slab is,the higher the negative temperature gradient is.It is suggested that the temperature parameters of track slab under extreme low temperature in Northeast China should be 75℃/m for positive temperature gradient and-25℃/m for negative temperature gradient.
作者
赵丽华
赵世嘉
何润东
ZHAO Lihua;ZHAO Shijia;HE Rundong(School of Civil Engineering,Dalian Jiaotong University,Dalian Liaoning 116028,China;Railway Engineering Beijing Key Laboratory,Beijing Jiaotong University,Beijing 100044,China;Liaoning Transportation Construction Management Co.Ltd.,Shenyang 110005,China)
出处
《铁道建筑》
北大核心
2022年第12期46-51,共6页
Railway Engineering
基金
国家自然科学基金(52108402)
北京交通大学轨道工程北京市重点实验室开放研究基金(2017GDGC-1)
辽宁省教育厅2022年度高校基本科研项目(LJKMZ20220833)。
关键词
无砟轨道
严寒地区
热传导方程
极端低温
温度场
ballastless track
severe cold area
thermal conduction equation
extreme low temperature
temperature field
