Research On Dynamic Response Of Pavement Structure Due To Vehicle And Pavement Interaction

As the development of road traffic, the large-scaled, high-speed, overloaded andheavy load phenomenon becomes extraordinarily common. The life of the highwaydesigned on the static load is becoming shorter and shorter. The damage anddestruction of road structure also appearances earlier. Due to the increasing influenceof dynamic load, the analysis results based on the static load have a big differencewith actual, and the traditional pavement design method based on static load is nolonger applicable. Therefore, the dissertation will target on the dynamic response ofroad pavement structure based on the interaction between vehicles and road. The maincontents are as follows:(1)The random load of vehicle is calculated by building four degrees of freedomvehicle model, and by deriving the time domain model of road roughness based on thepower spectral density function of road roughness(2)According to the layered theory, the road is divided into surface, grass-roots,sub-base and soil base to establish a three-dimensional finite element model of theroad structure. Considering the interaction between vehicles and road, the analysis ofthe dynamic response of pavement under a moving vehicle random load is done byusing the finite element software, ABAQUS. The analysis showed that the surface ofthe road in a triaxial compression stress state, and the shear stress of the surface layerwas much larger than the other layers; The maximum longitudinal tensile stress andtransverse tensile stress comes to the junction of the base and sub-base. And then,these factors including road structure parameters (thickness, modulus of elasticity)and vehicle operating parameters (speed, axle load) which have influences on thedynamic response of road are analyzed.(3)Considering the creep properties of asphalt materials, the permanentdeformation (rutting) of asphalt pavement is simulated by using finite elementsoftware, ABAQUS. And these factors including the temperature, the thickness of theasphalt surface and the axle load are analyzed.(4) Finally, in order to improve vehicle comfort and to reduce the road damagedue to dynamic load, the optimization of vehicle suspension parameters is done by useMATLAB.