高温多雨地区柔性基层沥青路面温度场分析及模拟研究

通过室外试验,分别测试了高温多雨条件下柔性基层、半刚性基层和倒装基层沥青路面的温度场,并利用数学方法对柔性基层沥青路面的温度场进行模拟。结果显示,3种路面上面层温度场差别很小,随着深度的增大,温度场的差别逐渐增大;3种路面基层的温度由高到低依次为:倒装结构>柔性结构>半刚性结构;底基层温度由高到低依次为:柔性结构>倒装结构>半刚性结构。柔性基层沥青路面的温度场随气温和太阳辐射呈周期性变化,且随着深度的增大,时间-温度曲线出现明显的滞后性,温度峰值逐渐减小。柔性基层沥青路面温度场可用衰减指数函数模型进行表示。

Analysis and simulation of temperature field of flexible base asphalt pavement in high temperature and rainy area

Through the outdoor test,the temperature fields of the flexible base layer,the semi-rigid base layer and the inverted base asphalt pavement under high temperature and rainy conditions were measured respectively,and the temperature field of the flexible base asphalt pavement was simulated by mathematical methods. The results show that the temperature field difference of the three pavement layers is very small,and the temperature field difference increases with the increase of depth. The temperature of the three pavement base layers from large to small is:flip-chip structure>flexible structure>semi-rigid structure. The order of the base layer temperature from large to small is:flexible structure>flip-chip structure>semi-rigid structure. The temperature field of the flexible base asphalt pavement has periodic variation with the temperature and solar radiation. With the increase of the depth,the time-temperature curve shows obvious hysteresis,and the corresponding temperature peak decreases gradually. The temperature field of the flexible base asphalt pavement can be expressed by the decay exponential function model.