高速铁路CRTSⅢ型板式无砟轨道温度梯度试验研究

Experimental study on temperature gradient for CRTS Ⅲslab-type ballastless track on high speed railway

根据现场监测数据,对高速铁路CRTSⅢ型板式无砟轨道复合轨道板温度梯度变化规律、温度梯度与太阳日辐射强度、日最高气温等环境因素的相关性进行了统计分析。研究结果表明:复合轨道板最大正、负温度梯度分别为0.69,0.35℃/cm;日最大正温度梯度一般出现在14:00—15:00,日最大负温度梯度一般出现在5:00—8:00;春夏季复合轨道板的温度梯度较其他季节大;复合轨道板正、负温度梯度均呈非线性分布,10:00—12:00非线性分布特性更为显著;日最大正温度梯度与日太阳辐射总量、日最高气温相关性较好,可根据本文获得的回归方程推测不同地区复合轨道板的日最大正温度梯度。

According to the field monitoring data,the composite track plate temperature gradient variation of high speed railway CRTS Ⅲ slab-type ballastless track and correlation among such environmental factors as temperature gradient,daily solar radiation intensity and the daily maximum temperature were analyzed. The research results showed that the maximum positive and negative temperature gradient of composite track slab are 0. 69 ℃ / cm and 0. 35 ℃ / cm respectively,daily maximum positive temperature gradient appears in 14： 00 ~ 15： 00,daily maximum negative temperature gradient generally appears in 5： 00 ~ 8： 00,temperature gradient amplitude in spring is larger than the one in other seasons,the positive and negative temperature gradient of composite track slab shows a non-linear distribution which is obvious in 10： 00 ~ 12： 00,the relevance among daily maximum positive temperature gradient,daily total solar radiation and daily maximum temperature is good. According to the regression equation presented in this paper,the daily maximum positive temperature gradients of composite track plate in different regions could be deduced.