Mechanical Responses Analysis Of The Asphalt Pavement Structure Based On Dynamic Modulus

Nowadays, asphalt pavement on mountain freeway has been built,especially large longitudinal slope has occurred slippage ,rutting and othet diseases because of pavement shear in different degrees in China. The increasing traffic and overloading vehicles accelerate the emergence of these diseases.Therefore, large longitudinal slope road caused the adverse effects of asphalt pavement,reducing shear damage and improving the quality of asphalt pavement structure, through the deep study of asphalt pavement structure on mechanical reponses analysis becomes very necessary.Asphalt, aggregate characteristics, grading , asphalt pavement performance and dynamic modulus of asphalt mixtures are studied in this paper. On the one hand, used limestone and basalt as aggregate, the modified asphalt ,50# asphlt and 70# asphalt as binding, according the design grading theory standard, the properties of the asphalt mixtures of are produced by the Marshall method; on the other hands, dynamic modulus of the asphalt mixtures are summarized and calculated method.Futhermore, the finite element software ABAQUS was applied to analyse typical semi-rigid bituminous pavement structure mechanics reponses with different vehicle loads,different speeds,different longitudinal slope conditions,which asphalt pavement shear strain change rule.The results showed that the upper layer,the surface layer and the following layer of a typical semi-rigid asphalt pavement will produce shear damage ,especially in the surface layer shear strain are more prominent,thus increasing the suface layer structure of the anti-rutting performance of asphalt pavement for increased resistance rutting is very important under the high temperature.In overload and slow conditions and the superposition of the horizontal stress caused by the top overall shear strain surface rapidly increase ,which will increase the push and hold road table of destructiong and interlayer bag slipping damage.Finally,comparative analysis of several different mechanical reponses of asphalt pavement and asphalt pavement rutting proposed technical measures.