关键词: 道路工程, 早期破坏, 莫尔圆, 拉-压复合剪切应力状态, 统一力学模式

Abstract: Based on the M-C criterion, a unified mechanical control index of asphalt pavement with multiple damage phenomena was proposed, that is asphalt pavement potential damage index(APPDI). Taking asphalt pavement of 5 highways as examples, using APPDI to analyze the mechanical models of pavement damage was studied on the basis of FEM calculation. The results indicate that the composition of the principal stress has a great influence on asphalt pavement damage. The different components of the principle stress are corresponding to different rutting, Top-Down cracks and bottom floor tension under different temperature. Combined with Mohr circle and the location in the pavement structure, APPDI can be used to judge damage forms of the asphalt pavement, which provides a certain theoretical basis for the interpretation of pavement failure mechanism and the optimization of pavement design.

Key words: highway engineering, early failure, Mohr circle, tension-compression composite shear stress state, unified mechanical model