温度应力作用下无砟轨道板的竖向变形特征分析

为研究轨道板在温度作用下的变形和竖向温度场的变化规律,对轨道板板角、板中等多点位的竖向位移及温度进行了长期的统计分析。结果表明:轨道板在环境温度影响下整体翘曲位移变化呈现规律性,一天中在午间高温时所产生的中部上拱变形量大于晚间的凹形翘曲变形量,且边缘处的竖向变形最为明显;板面下20 mm深处和180 mm深处的温度变化存在3 h的相位差值;夏季时板面温度与环境温度呈非线性关联,而冬季时环境温度和板面温度呈现为线性关联;板的向下位移量大于板的向上位移量。

Analysis of Ballastless Track Plate Vertical Deformation Characteristics under Thermal Stress

In order to study the deformation and vertical temperature field change law of the track plate under temperature action,a long-term statistical analysis of multi-point vertical displacement and temperature of the track plate angle and the plate itself is conducted.The results show that the change law of the overall track plate warping displacement under the influence of ambient temperature is regular,the amount of arch warpage generated by the track plate at high temperature during the day is greater than the concave warping deformation at night,and the vertical deformation at the plate edge is most obvious.There is a 3-hour phase difference at the 20mm depth and the 180mm depth under plate surface with the temperature variation;in summer,the plate surface temperature and the ambient temperature are non-linearly related,while in winter,the correlation between the ambient temperature and the plate surface temperature is a linear association.The downward displacement of the plate is greater than its upward displacement.