铁道建筑

为了提高无缝线路的稳定性，本文基于热传导原理，结合实测钢轨温度数据，构建75 kg/m钢轨温度热传导数学模型，研究重载列车作用下钢轨温度场的分布特征。结果表明：在重载铁路无缝线路稳定性计算中，轨腰温度可以代表钢轨截面温度；在过车中及过车后的短时间内，轨腰温度相对于截面温度表现出滞后性，轨腰温度最大值略高于截面温度最大值；轨头、轨腰和轨底三个部位的实测温度平均值能够比较真实地反映钢轨截面平均温度的变化情况，本文采用的温度测量方式合理且可行；列车行驶过程中，轮对与钢轨摩擦产生的热量使钢轨轨头顶面温度升高30.3℃，达到68.3℃；钢轨温度变化速率在轨头与轨腰分界处变化明显，不同时刻钢轨温度变化速率不同且呈非线性变化。

In order to improve the stability of continuously welded rail(CWR), this paper constructed a mathematical model of 75 kg/m rail temperature heat conduction based on the principle of heat conduction and combined with measured rail temperature data, and studied the distribution characteristics of rail temperature field under the action of heavy haul trains. The results indicate that in the stability calculation of heavy haul railway CWR, the rail waist temperature can represent the rail section temperature. During and shortly after vehicle passing, the temperature of the rail waist shows a lag relative to the temperature of the section, with the maximum value of the rail waist temperature that is slightly higher than the maximum value of the section temperature. The average measured temperatures of the rail head, rail waist, and rail bottom can accurately reflect the changes in the average temperature of the rail section. The temperature measurement method used in this paper is reasonable and feasible. During the operation of the train, the heat generated by the friction between the wheelset and the rail increases the temperature of the top surface of the rail head by 30.3 ℃, reaching 68.3 ℃. The rate of temperature change of the steel rail varies significantly at the boundary between the rail head and the rail waist, and the rate of temperature change of the steel rail varies and shows nonlinear changes at different times.