ABSTRACT
In order to explore the relationship between the bonding state exiting in different pavement layers and the mechanical response, a finite element analysis model of the pavement was established with three preset interlayer contact interfaces: the upper asphalt layer, middle layer-lower layer, and lower layer-base layer. And a half-sine load was used to simulate the vehicle driving process. Seven equations for the decay of the friction coefficient with service time were constructed and divided into three types of working conditions according to the decay rate to characterize the interlayer bonding under different service years. For the friction coefficients predicted by different equations under different years, the mechanical response of the pavement structure was calculated. It was found that for the selected typical pavement structures: (1) Poor interlayer bonding conditions lead to peak shear stresses at the interface location, and the maximum shear stress occurred at the bottom of the upper surface layer; (2) As the service time increases (the interlayer bonding condition deteriorated), the maximum shear stress in the asphalt layer increased by 30% and the maximum tensile strain at the bottom of the asphalt layer increased 5.00 times; (3) The trends of the maximum shear stress and the tensile strain of the asphalt layer were the same under different working conditions. The maximum shear stress and the tensile strain of the asphalt layer grew relatively slowly when μ=0.4-1.0. With the decay of the interlayer bond state, when μ<0.4, the maximum shear stress and the tensile strain of the asphalt layer began to grow rapidly.
