The Research On The Dynamic Interaction Between Heavy Vehicle And Rigid Pavement Structure

With the development of traffic and the replacement of vehicle, the bearing capacity of the expressway pavement refer as infrastructure is becoming difficult to satisfy the service demand, and the current pavement design standard is unable to describe the behavior of pavement stress and deformation correctly due to oversimplified assumption. Begin with the research of vehicle dynamic loading, a profound research of the dynamic interaction between heavy-vehicle and rigid pavement is intended to conduct through theory analysis and trial research in this paper.1. A numerical computation of vehicle dynamic wheel loading due to roughness of pavement is conducted using one-quarter vehicle model, which regard the suspension system as one degree of freedom with mass, stiffness and damping, and consider the vertical vibration of vehicle. The effect of vehicle wheel weight, moving velocity, roughness of pavement, stiffness and damping of the suspension system on the vehicle dynamic wheel loading is studied.2. A model based on the dynamic interaction between heavy-vehicle and rigid pavement is established. The exact solution of the dynamic deformation and the numerical solution of the dynamic response in pavement slab suspended on the cohesive-elastic VLASOV modeled subgrade is derived from the integral-transforms method and the finite element method respectively when moving loading is subjected .3. The pseudo-time method is used to substitute the variable time with the variable position in the emulation analysis of the dynamic interaction between heavy-vehicle and rigid pavement based on the finite element method, which solve the problem of the moving vehicle model. The dynamic response involved dynamic deformation and the dynamic strain is derived using the Newmark- β method when subjected to moving vehicle loading.4. The trial research of rigid pavement dynamic response is conducted in the Mn/ROAD facility sited in the Minnesota of the United State. The study of the longitudinal and traverse dynamic strain at the upper and bottom of slab, and the dynamic strain in dowel bar, and the dynamic soil pressure at the upper subgrade , in addition to the influences is conducted through choosing three research section andcollecting the time-dependent curve of the dynamic strain in the different position and depth of rigid pavement slab and soil pressure at the upper subgrade when the Mn/ROAD truck with two kinds of weight is passing with different velocity.5. The verification of the suggested method in this paper is conducted through comparing the computed solution with the trial data when input the parameter of the Mn/ROAD test into the self-compiled program. Furthermore, the numerical analysis of the effect of some factor, such as vehicle axle weight, moving velocity, pavement thickness, and subgrade stiffness on the dynamic deformation and the dynamic strain in rigid pavement slab through changing the computation parameter.