基于有限元的沥青路面温度场数值模拟方法研究

A Study of Numerical Approach for Asphalt Pavement Temperature Field Simulation Based on the Finite Element Method

由于沥青混合料为温度敏感性材料,因此温度场对沥青路面结构的承载能力和使用性能会产生重大影响。通过对沥青路面温度场现有理论及国内外研究者的现有成果进行总结,提出了基于有限元法的沥青路面热平衡方程中材料属性与边界条件的数值模拟方法。同时,通过温度场的数值计算值与RIOHTRACK环道试验场测得的实测值进行对比,验证该数值方法的可行性。最后,依据我国东部某地区典型的气候数据对高温、低温、常温三个典型温度场进行数值计算,分析各路面温度场的特点,为我国路面设计及后续研究提供一定的参考价值。

Asphalt mixture is a temperature-dependent material and because of that, the temperature field has a significant impact on the bearing capacity and performance of the asphalt pavement structure. By summarizing the existing theories of temperature field of asphalt pavement and the existing achievements of researchers at home and abroad, a numerical simulation approach for simulation of temperature field within an asphalt pavement structure is proposed. The feasibility of the numerical method is verified by comparing the numerically predicted temperature distribution with that of the in situ measurement at the RIOHTRACK road test field in Beijing. Finally, based on climatic data from an eastern region of China, three typical temperature fields of high temperature, low temperature and normal temperature are numerically calculated and analysed. The case study can serve as an example for using the new approach to improve the asphalt pavement design by considering the effect of temperature in a realistic way.