中文摘要：

研究目的：为得到CRTSⅡ型板式无砟轨道结构温度场分布及变化规律,以沪昆高速铁路CRTSⅡ型板式无砟轨道为研究对象,沿轨道结构深度方向布置传感器,对各结构层的温度进行连续测试。研究结论：（1）轨道结构温度以日为周期往复变化;（2）测试期间内,轨道板顶部最高温度较气温高10℃以上,轨道板最大正、负温度梯度分别为48.0℃/m、-33.6℃/m;（3）随着轨道结构深度的增加,顶部温度和温度梯度的波动幅度逐渐衰减且相位差逐渐增大,CA砂浆层处温度曲线出现突变,底座板的温度梯度变化较小;（4）基于最小二乘法对轨道结构温度和温度梯度进行回归分析,建立了适用于高温条件下纵连板式无砟轨道温度场荷载模式,以及轨道板最大温度梯度与对应轨道板顶部温度的预估模型,其相关系数为0.82~0.93,预估模型精度较高;（5）该研究成果可为CRTSⅡ型板式无砟轨道温度荷载模式的选择提供参考。

英文摘要：

Research purposes： In order to get the temperature distribution and variation rules of CRTS 11 slab ballastless track, it took the Shanghai- Kunming High Speed Railway CRTS 11 slab ballastless track as research object, and each structural layer temperature was continuously tested by arranged sensors along the track structure in the depth direction. Research conclusions： （ 1 ） The track structure temperature changes with a daily cycle back and forth. （2） In the test period, the highest temperature of the top surface of track plate was above IO~C than air temperature, and the maximum positive and negative temperature gradient was 48.0~C/m and - 33.6~C/m. （ 3 ） With increasing depth of track structure, the fluctuations of the top surface temperature and temperature gradient gradually attenuated and the phase difference of those increased, and the mutation appeared on the temperature curve in CA mortar layer, for another the base plate temperature gradient changed slightly. （4） The temperature field load mode of vertically slab track was established under high temperature conditions by the regression analysis of temperature and temperature gradient, which was based on least squares method, and the prediction model of track plate maximum temperature gradient built upon the corresponding top surface temperature, in addition the accuracy of prediction models was high with the correlation coefficient varying from O. 82 to 0.93. （5） The research results can provide references for selection of CRTS II slab baUastless track temperature load mode.