The Mechanical Properties Of Asphalt Pavement With Unbound Aggregate Base

The most form of the built highway in our country is semi-rigid base course asphalt pavement. But the semi-rigid base easily gives early to shrinkage cracking with the change of temperature and humidity. This pruduces reflection crack in asphalt surface, results in other diseases, and works severity early damage. According to this situation, it is necessary to deeply study and apply new structure type of pavement base.This paper makes use of finite element analysis program ABAQUS to research the pavement performance of the asphalt pavement with unbound aggregate base and the semi-rigid base course asphalt pavement with unbound aggregate intermediate layer:The mechanical properties of unbound aggregate detailed analysis. The different models such as elastic model, elastic-plastic model and permanent deformation model base on different theories.The static elastic-plastic model is went up. The inflection of the change of the plastic parameter of graded gravel materials in asphalt pavement and the change of structure-layer parameter on pavement performance is analyzed.The dynamic Visco-elastic-plastic model is went up. The pavement mechanical response under dynamic load has been studied. The pavement mechanical response under a single load and cyclic load has been analyzed.Through the establishment of fracture mechanics finite element analysis model, analysis in the semi-rigid base and asphalt surface between the established and non-graded gravel layers for the two mechanical state changes in stress and deflection, to verify the transition of graded broken stone layer cracks in the role of inhibitory reflex.