Dynamic Response Simulation And Test Research Analysis Of High-grade Asphalt Pavement

At present, asphalt pavement with semi-rigid base course is the main type of China’s high-grade pavement structure. But the asphalt pavement is easily destoryed under the action of overload and overspeed traffic. Asphalt surface layer has visco-elastic properties, but most scholars tend to study asphalt pavement as elastic structure, and the research of the layered visco-elastic asphalt pavement structure was relatively less. Therefore, it is extremely significant to consider the visco-elastic properties of the asphalt surface and study the asphalt pavement dynamic response under the load of moving vehicles.Based on the basic assumptions of the layered visco-elastic system, the ABAQUS finite element software was adopted to establish a three-dimensional asphalt pavement model. Asphalt surface layer was modeled as viscoelastic Burgers constitutive model material, in order to simulate double shaft wheel load running by setting multiple load steps, and the dynamic response of semi-rigid asphalt pavement structure under moving loads was calculated by using Dynamic, Explicit Power analytical methods. Vertical displacement, stress, strain of structural layers was analysed, while the influnce of the dynamic characteristics of pavement structure were also researched in different speed and load conditions.The result shows that the impact of the load and speed parameters on the pavement structural dynamic response is consistent with the law of the relevant research literature. Besides, the increase of the load, the displacement, stress, strain of the pavement structure presented a linear increase, but a decrease with the speed increase.Finally, a highway asphalt pavement test section was build to verify the simultion results, and it successfully conducted test research on dynamic response of pavement structure under different vehicle speed and load conditions by the test system. The field test data was also compared with the numerical results to verify the reliability of this computing model, and provided a certain basis of the theoretical and experimental for optimizing the design and extending the service life and studying the failure mechanism of asphalt pavement in future.