Study On The Micromechanical Behavior Of Asphalt Pavement Under The Interaction Of Vehicle Road

With the rapid development of transportation industry,the road overspeed overload problems appear constantly,lead to the road damage is serious,leading to running vehicles on the road of complex vibration,affect the service life of the car.The car road as a system,reduce the car road interaction in the system,can to a certain extent,to ensure that the vehicle driving stability and safety,therefore,it is necessary to conduct the thorough research to the problem of asphalt surface damage.Current as the main traditional means of research of asphalt pavement material performance,test method and construction experiences will waste more time and energy,and two methods to get conclusion belongs to the macro level,the more difficult to reflect asphalt pavement internal micromechanical properties of composite materials.The asphalt mixture has obvious dispersion,is a kind of multiphase compound material,and the stress and strain law in its destruction is difficult to be analyzed accurately.It is difficult to reveal the microscopic mechanical behavior of the internal structure of asphalt mixture,which can not reflect the discontinuity of the material.In this paper,the main research object is asphalt mixture,which is simplified as a composite material consisting of two materials,including asphalt binder and coarse aggregate.The discrete element model of asphalt mixture was established by particle flow software PFC2 D.Is obtained by the numerical experiments of uniaxial compression the micromechanical parameters of asphalt mixture discrete element model,the material physical test stress strain curve and the stress strain curve of virtual numerical experiments are compared,for discrete element model of asphalt pavement has provided the basis to determine the micromechanical parameters,at the same time,studied the parallel bond cohesive force and the friction Angle of the parallel bond parallel to the tensile strength,bond and the coefficient of friction contact model parameters on the influence of the asphalt mixture under uniaxial compression test results.On this basis,the use of the software PFC2 D particle flow generated mul tiple discrete element model of asphalt pavement structure,its in static load an d vibration load was studied under the action of the mechanical response of di screte element are analyzed from the points of micromechanical level pavement mechanical characteristics of the model.In this paper,the dynamic characteristics of the asphalt pavement under the interaction of the vehicle road are studied,and the relationship between the different parameters and the dynamic response in the vehicle suspension model is analyzed.The crack initiation,expansion and penetration of bituminous materials were studied by the numerical simulation of the fracture of the discrete element model of asphalt pavement.