Finite Element Analysis Of Semi-rigid Base Asphalt Pavement Based On Viscoelasticity

For a long time,the calculation and analysis of asphalt pavement utilize linear constitutive models. However,it is quite different with factual situation. The influence of temperature and loading time for pavement structural mechanics can not be denoted and the results of analysis are limited on some extent.Firstly, the viscoelastic character of asphalt mixture is elucidated. With theological theory, the constitutive model of asphalt mixture is established by theoretical deduction. The influence of temperature and loading time is denoted in this model. The parameters of 1-D viscoelastic model are obtained by relaxation texts as well as numeric calculation and the expression of 3-D viscoelastic model is deduced by mechanical theory.Secondly,a appropriate 3-D FEM model based on the typical semi-rigid base asphalt pavement is established,the results of computation model compare with Bisar's. It proves that FEM is feasible in pavement analysis. Then FEM and viscoelasticity are used to analyze the structural response of the 3-D asphalt pavement under static loading. This paper analyzes the effect of viscoelastity on different pavement structure as well as material properties,and the structural response of different horizontal as well as vertical loading.On the basis of the foregoing analysis,the author concludes in this analysis of several factors driving influence to pavement structural response,and gives some reasonable advice to failure phenomenon of asphalt pavement. Finally, the author puts forward the farther work in this research based on problems still exist in asphalt pavement.