CRTSⅢ型无砟轨道冬季温度场特性

Characteristics of Temperature Field in Winter of CRTS Ⅲ Ballastless Track

为研究CRTSⅢ型无砟轨道温度场分布规律,在昌赣客运专线外进行足尺无砟轨道板温度场监测,基于统计学原理分析冬季轨道结构温度变化规律并提出适合CRTSⅢ型无砟轨道的竖向温度梯度预估模型.研究结果表明:CRTSⅢ型无砟轨道结构温度场受外界环境影响较大,其中轨道板顶面温度变化最为明显,沿深度方向各结构层温度峰值有明显的滞后现象;竖向温度梯度大于横向温度梯度,对结构温度影响起主导作用;日太阳辐射总量和最大温度梯度具有较好的相关性,据此建立了冬季日最大温度梯度经验回归公式,可为不同气候条件下的CRTSⅢ型无砟轨道的温度梯度研究提供参考.

In order to study the temperature field distribution of CRTS Ⅲ ballastless track,the temperature field of fullscale ballastless track slab was monitored outside the Changgan passenger dedicated line.Based on the statistical principle,the temperature change rule of track structure in winter was analyzed and a vertical temperature gradient prediction model suitable for CRTS Ⅲ ballastless track was proposed.The results show that the temperature field of CRTS Ⅲ ballastless track structure is greatly affected by the external environment,of which the top surface temperature of track slab changes most obviously,and the peak temperature of each structure layer along the depth direction has obvious hysteresis phenomenon.The vertical temperature gradient is larger than the transverse temperature gradient,which plays a leading role in the temperature effect of the structure.There is a good correlation between the total amount of daily solar radiation and the maximum temperature gradient.Based on this results,the empirical regression formula of the maximum temperature gradient in winter is established,which can provide a reference for the study of the temperature gradient of CRTS Ⅲ ballastless track under different climatic conditions.