沥青路面温度场的预估方法

Predictive method of temperature field in asphalt pavement

为了快速、准确地获取沥青路面温度场变化,开展了温度场预估方法研究.首先借助有限元方法建立了沥青路面温度场计算模型;然后分析了大气温度、日太阳辐射量等气象因素对沥青面层温度场的影响规律,得到了路面最高温度与大气温度、日太阳辐射量之间的关系式,在此基础上建立了路面内部任一深度处最高温度与路面最高温度相关关系的图表和公式;最后依据沥青路面温度场的日变化特点,以余弦函数方式建立了路面内不同深度处随时间变化的温度函数模型,结果显示:温度场预估值与计算值误差控制在0.5℃之内,完全满足工程使用的要求.因此,利用该模型可实现白天时段的沥青路面温度场预估,通过简单程序即可快速实现,且具有较高的精度.

To obtain the temperature variation data of asphalt pavement accurately and quickly, the me- thod of predicting temperature field was investigated. The calculating process of asphalt pavement tempe- rature field was modeled by finite element method. The effects of air temperature and solar radiation on temperature characteristic of asphalt layer were discussed. The maximum temperature on pavement sur- face was expressed by air temperature and solar radiation, and the correlation of maximum temperature between pavement surface and any point in asphalt layer was established by figure and formula. Based on the daily property of temperature field, the temperature was modeled by cosine function with the parame- ters of time and depth to calculate the temperature during daytime. The results show that the margin of er- ror between predictive value and calculation is less than 0.5 ℃ , which can meet the requirements of en- gineering application completely. The proposed method of predicting temperature field has the advantage of simplicity with high accuracy.