为得到圆曲线上无砟轨道结构温度场分布的时变规律，在某客运专线圆曲线段上的CRTSⅡ型纵连板式无砟轨道中埋设温度传感器，对其温度分布进行了长期连续观测，在大量测试数据的基础上通过概率统计获得无砟轨道横、竖向温度梯度荷载模式． 结果表明: 无砟轨道结构在与外界的热交换过程中，其内部竖向和横向温度呈非线性分布;轨道结构温度随着环境温度变化呈现周期性变化; 随着与表面距离的增加，不同位置处出现温度峰值的时间存在明显滞后，轨道结构底部出现温度峰值的时间比顶部延迟约5 h;无砟轨道竖向温度梯度分布曲线符合指数分布规律，与中国铁路设计规范规定的箱梁竖向温度梯度分布曲线在形式上较为相近．

In order to reveal the time-dependent temperature distribution in the ballastless track structure on a curve line,a continuous observation of CRTS Ⅱ longitudinal plate-type ballastless track was carried out with temperature sensors.After the statistical analysis of a great amount of measured temperature data,the vertical and horizontal temperature gradients of the track were obtained.The results show that ( 1) the vertical and horizontal temperature distributions of the ballastless track are both nonlinear in the process of heat exchange with the outside; ( 2) the temperature of the track periodically changes with the environment temperature; ( 3) the time corresponding to the maximum temperature delays due to the increase of the distance to the track surface,even presents a 5 h delay at the bottom of the track structure in a comparison with the time on the surface; and ( 4) the vertical temperature gradient is in an exponential distribution,which matches the distribution curve suggested by the design standard for railway bridges and culverts in China.