Study On Nonlinear Asphalt Pavement Based On ABAQUS

Asphalt mixture is typical of viscoelastic materials, and will show some plastic Characteristic under the heavy load. In the past, asphalt pavement structure was regarded as complete flexibility;even if its viscoplastic was regarded, this analysis does not reflect the nonlinear characteristics. The visco-elastic analysis of the semi-rigid asphalt road surface structure, in particular the flexible base asphalt pavement for the overall structure of viscoelastic analysis, have a clear understanding of this international generic pavement performance and have important engineering significance.In this paper, the surface of the semi-rigid base layer structure and the whole layer of the flexible base layer structure were regarded as nonlinear structure,based on the elasticity, plasticity, viscoelasticity and nonlinear equations, the iterative method, used ABAQUS finite element software powerful nonlinear analysis functions.First, consider the visco-elastic-plastic of semi-rigid asphalt pavement layer, under the single load . Deflection mainly manifested in the surface in the static load; the deflection of semi-rigid base have little contributions. the more asphalt mixture of asphalt content is, the more viscous performance significantly. asphalt mixture is timing, it is different for the pavement to correspond in a short period of time and a long period, with the growth of viscous indicators tends to be stable.Secondly, consider the dynamic load vehicles of the road .Under the dynamic loads, the value also showed volatility, with a general trend to a particular value.Finally, the whole layer of the structure is regarded as nonlinear character. This analysis is based on the flexible base asphalt pavement to analyze, and come up with conclusions : Due to the material of the surface and the base is similar , this kind of pavement structure have reasonable force, clear transmission line, coordination deformation; asphalt stabilized base course with the asphalt surface together constitute the entire thick asphalt surface.it can improve overall performance. In view of the above analysis, the evaluation of the structure of the asphalt pavement performance evaluation indicators is concluded: Pavement Performance coordination factor, fully affirmed the performance of the flexible base structure of, and can improve our road design standard.