Analytical Calculations for Asphalt Pavement Considering Interlayer Performance

Asphalt pavement structures are composed of layered materials and are assumed to be completely continuous elastic layered systems in structural design. However, a number of studies have indicated that the interface is not completely bonded. Hence, this paper presents the solution for an elastic multilayered system considering interface properties. First, a nonlinear shear model was adopted as the interface bonding model, a solution of the elastic multilayered system considering the interface bonding model was proposed, and the calculation program PADS was verified. Then a comparison between the product KΔu and shear stress τzr at the interface was used to verify the accuracy of the recursive coefficient calculation in the program, and the calculation results of PADS and BISAR were used to verify the accuracy of the numerical computations. Finally, the effect of the interface condition between the asphalt layer and semirigid base layer on the performance of asphalt pavement was analyzed. The research results can provide guidance for the design of asphalt pavement structures and the selection of adhesive layer materials.