Considering pavement roughness, this study on a vehicle-pavement coupled system was mainly based on the linear elastic model in frequency domain. The nonlinear dynamic numerical model for the system was established using finite element method. The model could simulate the movement and jumping of vehicles in the time domain. The results for the new model were verified, and they showed that the new model could reflect the true vibration between vehicle and pavement. The new model indicated that the pavement roughness was severe, and the vibration displacement of the pavement was large. Results showed that the maximum displacement of the C-level road roughness was 1.31 times than that of the A-level road roughness under the same condition. However, the vibration frequency of the pavement is not significantly affected by the roughness.

Analysis of the vehicle-pavement couple system was mainly based on the linear elastic model in frequency domain considering pavement roughness. The nonlinear dynamic numerical model for the vehicle-pavement coupled system was established using finite element mothed. Using the model, the deformation characteristics of asphalt concrete pavement were studied under the conditions of different pavement roughness, different vehicle speeds, different vehicle loads and different subgrade strength. The pavement roughness was worse and the vibration deformation of the pavement was larger, the max deformation of the C level pavement roughness was 1.31 times than that of the A level pavement roughness. With the faster of the vehicle speed, the deformation of pavement was smaller, but the trend was not obviously. The deformation of pavement increased obviously for overload, and the ratio of the overload reached by 100%, the ratio of deformation increased by 50%~109%. The deformation of pavement increased obviously for the subgrade strength reduction, the subgrade strength was reduced by 28%, and the deformation of the pavement increased by about 15%.