关键词: 道路工程, 沥青路面, 敏感度, 当量包络面积, 应力传递行为

Abstract: In view of the lack of evaluation indexes for the coordination of asphalt pavement structure layer materials, the sensitivity of mechanical parameters and equivalent envelope area of stress transfer path were proposed to analyze the stress transfer behavior of asphalt pavement structure through mechanical calculation. Software was developed to calculate the equivalent envelope area that can quantitatively and equivalently evaluate the coordination among different layers and visualize the mechanical transfer behavior of each structural layer. The results show that the deflection sensitivity can evaluate the rigidity of the whole structure, and the stress sensitivity can evaluate the stress distribution uniformity and utilization efficiency of each layer. Through visualization of stress transfer path, equivalent envelope area can quantitatively evaluate stress transfer behavior. The rationality of the proposed indexes was verified by FWD deflection test, inverse modulus and pavement disease investigation results of Yunluo test road. The proposed indexes and research ideas can make up for the deficiency that the current code only uses fatigue life to judge whether the pavement structure is reasonable or not, and can provide ideas for the optimization design of pavement structure.

Key words: highway engineering, asphalt pavement, sensitivity, equivalent envelope area, stress transfer behavior