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为较准确掌握无砟轨道温度场的分布规律,建立无砟轨道温度与环境温度的对应关系,为温度应力的计算和无砟轨道设计提供基础参数,本文测试了双块式无砟轨道不同部件、不同位置的温度和环境温度变化情况,建立有限元模型对无砟轨道温度场进行了数值模拟和对比.实测数据及数值模拟的结果均表明:道床板温度随外界气温呈以日为周期的周期性变化,秋季平均每天的升温时间约为8 h,降温约16 h;由于热交换条件的差异,距轨道表面越远,轨道温度受环境气温的影响越小,道床板角部的温度变化幅度大于中部,支撑层与基床表层的温度变化幅度很小;道床板内存在较大的温度梯度,随着距表面距离的增大,温度梯度逐渐减小,至支撑层时温度梯度可忽略不计;采用有限元模拟的方法获取无砟轨道温度随气温变化规律是可行的.
In order to accurately grasp the distribution of temperature field of ballastless orbit, the corresponding relationship between ballastless orbit temperature and ambient temperature is established to provide basic parameters for temperature stress calculation and ballastless track design. In this paper, different components of ballastless track , Temperature and ambient temperature at different locations, the finite element model was established to simulate and compare the temperature field of the ballastless track.The results of the measured data and the numerical simulation show that the temperature of ballastless bed varies with the ambient temperature The average daily temperature rise time in autumn is about 8 h and the temperature is about 16 h. Due to the difference of heat exchange conditions, the temperature of the track is affected by the ambient temperature as the farther away from the track surface, The amplitude of the temperature difference between the support layer and the bed surface is very small; there is a large temperature gradient in the channel bed, and the temperature gradient decreases gradually as the distance from the surface increases, and the temperature gradient to the support layer is negligible Excluding the method of finite element simulation to obtain the ballastless track temperature variation with temperature is feasible.