In order to prevent and control the differential settlement of expressway subgrade widening project and ensure the engineering quality,the influence of pavement layer modulus and thickness,base layer modulus and thickness,sub-grade modulus on settlement deformation of expressway widening subgrade were analyzed systematically by using finite ele-ment method.The results show that parameters of the pavement structure layer have a significant effect on the mechanical and deformation characteristics of the widened subgrade.The settlement of expressway widening subgrade decreases signif-icantly with the increase of the thickness and stiffness of pavement structure layer.Improving the thickness and stiffness of pavement structure layer can effectively prevent differential settlement in expressway widening project.
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