城市道路沥青路面温度场数值模拟分析

Numerical Simulation Analysis on Temperature Field of Urban Road Asphalt Pavement

为了探究环境温度及沥青材料热属性参数对路面结构温度场的影响,选取4种高温情况开展沥青路面温度场模拟,分析不同高温条件、不同材料热属性参数下的路面各结构层的温度变化,主要结论如下:路面结构温度随着环境温度升高而升高,但增长幅度沿深度方向逐渐递减,路表面下0~1m内温度受环境温度影响较大,1~3m内受影响减小;各面层结构温度变化规律基本与环境温度相似,存在最高温度滞后现象,中面层滞后约1h,下面层滞后约3h;通过降低路面材料太阳辐射吸收率,能够显著降低路面温度;上面层材料比热容和热传导率对结构整体温度的影响较为显著。

In order to explore the influence of ambient temperature and thermal property parameters of asphalt materials on the temperature field of pavement structure,four kinds of high temperature conditions are selected to simulate the temperature field of asphalt pavement,and the temperature changes of each structural layer of pavement under the different high temperature conditions and the thermal property parameters of different materials are analyzed.The main conclusions are that the temperature of pavement structure increases with the increase of ambient temperature,but the growth rate decreases gradually along the depth direction.The temperature within O~l m below the road surface is greatly affected by the ambient temperature,and the influence within 1~3 m decreases.The temperature change law of each surface layer structure is basically similar to the ambient temperature,and there is a maximum temperature lag phenomenon.The middle surface layer lags about lh,and the lower surface layer lags about 3 h.By reducing the solar radiation absorption rate of pavement materials,the pavement temperature can be significantly reduced.The specific heat capacity and thermal conductivity of the upper layer material have a significant effect on the overall temperature of the structure.