沥青路面结构非线性瞬态温度场数值模拟

Numerical Simulation of Nonlinear Transient Thermal Field for Asphalt Pavement

为了较准确地预测路面结构温度分布,解决实测耗费大的问题,基于热传学原理,建立沥青路面结构体系的非线性瞬态温度场计算模型,借助路面所处地区的标准气象资料,确定温度场的边界条件和初始条件,采用AD INA有限元进行分析求解。计算结果表明:沿路面深度方向,温度呈非线性分布并出现变化幅度减小、变化相位滞后的现象;日温差随路面深度增加呈指数分布迅速减小。计算结果和实测值的对比分析表明,该模型具有很高的预测精度。

To effectively predict the thermal distribution of the pavement, the numerical model of nonlinear transient thermal field for the asphalt pavement was established based on heat conduction theory. Then, the initial and boundary conditions of the thermal field were obtained by analyzing the meteorological data. Finally, the thermal field of the asphalt pavement was simulated by ADNIA software and the model was verified by comparing the calculation results with the measured datum. The results show that the temperature changes nonlinearly with the depth of the pavement. As the position of the pavement deepens, the amplitude of variation of the temperature decreases and the phases retard. The relationship between the temperature difference within one day and the depth of the pavement can be described by an exponential function.