Structural Response Analysis of Nonlinear Pavement Based on Granular Material

Abstract

For containing gravel layer structure of flexible asphalt concrete pavement structure, the response laws of gravel pavement structure under elastic and nonlinear were comparatively analyzed through the UMAT subroutine programming and FEM. The results show that when considering the nonlinearity of gravel base, the tensile stress and vertical stress of base layer in pavement structure are quite different from linearity condition. With the increase of the load, the tensile stress of the base layer increases nonlinearly, and is less than that of the elastic gravel material under heavy load. Considering the non-linear condition of gravel, the vertical stress of pavement structure increases and mainly occurs in the gravel base.