Effects of Layer Interface Conditions on Fatigue Behavior of AsphaltPavements with Semi-rigid Bases

摘要

Effects of the layer interface condition on fatigue behavior of asphalt pavements withrnsemi-rigid bases were evaluated in this study by means of viscoelastic three-dimensional finiternelement analyses. The Coulomb friction model was adopted to simulate the behavior of the layerrninterface. Effects of the position of the frictional interface, temperature, and friction coefficientrnwere investigated. The results show that fatigue cracking is unlikely to occur in AC layers for arnproperly designed asphalt pavement with semi-rigid bases if all layer interfaces are fully bonded.rnA frictional interface can result in large horizontal tensile stress at the bottom of the AC layer thatrnforms the interface. Depending on the position of the frictional interface, fatigue cracking mayrninitiate at the bottom of HMA or at the bottom of an intermediate AC layer. With the increase ofrnthe Coulomb friction coefficient, the tensile stress at the bottom of the corresponding AC layer canrnbe significantly reduced, especially at high temperatures.