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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 get the time-varying law of the temperature field distribution of ballastless track structure on a circular curve, a temperature sensor is embedded in the CRTS Ⅱ longitudinal plate ballastless track on the circular curve section of a passenger dedicated line, and its temperature distribution is continuously observed for a long time. Based on a large amount of test data, the horizontal and vertical temperature gradient load modes of ballastless orbit were obtained by means of probability statistics.The results show that the vertical and horizontal temperature of ballastless track are non-linearly distributed during heat exchange with the outside world, The temperature of orbital structure changes cyclically with the change of ambient temperature. With the increase of the distance from the surface, the time of temperature peak appears obvious lag at different positions, and the temperature peak at the bottom of orbital structure lags behind the top about 5 h. The vertical temperature gradient distribution curve of the track accords with the exponential distribution law, which is similar in form to the vertical temperature gradient distribution curve of the box girder specified by China Railway Design Code.