高速铁路连续式无砟轨道温度场分析

Study on Temperature Field of Continuous Ballastless Track for High-speed Railway

基于传热学原理,建立高速铁路连续式无砟轨道三维温度场有限元分析模型,以CRTSⅡ型轨道板温度场为研究对象,在验证模型有效性的基础上,分析轨道板内部温度场分布的时变规律和太阳辐射、风速、砂浆层热传导性能、环境变化速度等因素对轨道板温度场的影响。研究结果表明:不同时刻轨道板内温度场随深度非线性变化;轨道板侧面日照情况对轨道板横向温度梯度有较大影响;轨道板表面对太阳辐射吸收能力越强或太阳辐射越强,轨道板温度梯度幅值越大;轨道板温度梯度随风速增加而减小;砂浆层导热性能对轨道板温度场影响较小;环境变化速度越快,轨道板温度梯度最大值越大。以上结果能够为连续式无砟轨道温度效应的研究提供一定参考。

A three dimensional temperature field analysis model of continuous ballastless track for high-speed railway was established by means of finite element method and heat transfer theory in this paper.With the temperature field of CRTSⅡ slab as study object,based on the verification of the effectiveness of the model,the time-variant distribution law of the slab temperature field was analyzed.Meanwhile,the influences of some factors on the slab temperature field were studied,such as solar radiation,wind speed,thermal conductivity of CA layer,and change rate of environment temperature.The results showed that the slab temperature and temperature gradient changed with slab depth nonlinearly in different time.The lateral temperature gradient of the track slab was greatly influenced by the sunlight condition of the track slab side.The stronger the solar radiation absorption ability of the slab surface or the solar radiation was,the greater the temperature gradient of the slab was.Slab temperature gradient decreased with the increase of wind speed.The influence of CA layer thermal conductivity on the temperature field of the slab was small.The faster the environment temperature changed,the greater the maximum temperature gradient of the slab was.The research results can provide reference for the study of the temperature load of continuous ballastless track structure.