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Granular road materials have been experimentally demonstrated to be cross-anisotropic.This paper explores the mechanical behavior of asphalt pavements with cross-anisotropic unbound aggregate layers(UAB)/subgrade through three-dimensional(3D)finite-element(FE)simulation.The analysis results indicate that(1)the cross-anisotropy of UAB has significant effects on the critical stresses and strains at critical depths;(2)the cross-anisotropy of subgrade has considerable effects on the surface deflection and the vertical strain at the top of the subgrade.Subsequent pavement performance predictions indicate that cross-anisotropy of UAB has great negative effect on pavement life in terms of fatigue cracking and rutting potential.Therefore,the cross-anisotropy of UAB and subgrade layer should be considered in the mechanical analysis of asphalt pavements.