Combining Finite Element Simulation to Analyse the Viscoelastic Mechanical Inverse Problem of Asphalt Pavement

Based on the viscoelastic theory, this paper establishes a variety of finite element model structures for asphalt pavements in combination with finite element software, and defines a variety of asphalt pavement damping forms using the ABAQUS program, and designs experimental loading conditions for asphalt pavements. On the basis of the viscoelastic behavior of the material, the viscoelastic intrinsic model of the asphalt pavement is given, and the viscoelastic mechanics inverse problem of the asphalt pavement is designed, and the finite element model is also used to compare the inverse problem with the inverse calculation. The results of the inverse computational comparison of the inverse problem were explored for the viscoelastic mechanical behavior of asphalt pavements, and the changes in the mechanical properties of asphalt pavement structures were analyzed for different braking coefficients, temperature fields, and loading loading frequencies. It is found that the maximum difference error between the inverse calculation results obtained for different asphalt pavement structures is less than 6\%, and the relative maximum error between the inverse calculation and the measured bending settlement value at a distance of 0.3m under 20t load is 12.65\%. Under different braking coefficients and temperature fields, the shear stress and transverse stress of asphalt pavement have obvious trends, and when the loading frequency is 20Hz, the dynamic modulus difference between different temperatures is large. The viscoelastic change of asphalt pavement can be obtained through backcalculation, and its mechanical change can also be analyzed to provide reference for improving the performance of asphalt pavement.