沥青路面表层温度场高精度数值仿真与参数反演

High-Precision Numerical Simulation and Parameter Inversion of Asphalt Pavement Surface Temperature Field

沥青路面温度场对沥青路面性能影响显著,是材料选择、性能评估的基础。太阳辐射、长波辐射、空气对流换热是沥青路面表面的主要热流项,其表达式中包含温度的4次项,温度场求解难度大。首先建立沥青路面表层温度场的精细化数值求解模型,通过迭代法实现复杂边界条件的解答。提出基于梯度下降法,对沥青路面温度场初始模型参数进行优化,通过长时间序列、特征时间序列的验证对模型参数进行反算的方法。通过实测气象、路面温度数据下的路面温度场参数反演,获得了路面典型的参数取值范围。

The temperature field of asphalt pavement has a significant impact on the performance of asphalt pavement and is the basis for material selection and performance evaluation. Solar radiation, long-wave radiation, and air convection heat transfer are the main heat flow terms on the asphalt pavement surface. Their expressions contain the fourth-order term of temperature, making it difficult to solve the temperature field. First, a refined numerical solution model of the asphalt pavement surface temperature field is established, and the solution to complex boundary conditions is achieved through an iterative method. This paper proposes a method to optimize the initial model parameters of the asphalt pavement temperature field based on the gradient descent method, and back-calculate the model parameters through the verification of long-term series and characteristic time series. Through the inversion of pavement temperature field parameters under measured meteorological and road surface temperature data, the typical parameter value range of the road surface was obtained.