Abstract:

:To ease the limitation of continuous medium theory, a uniaxial compression test of asphalt mixture is simulated with the discrete element method （DEM） , and the constitutive behaviors of the mixture accordant with practical results are investigated. Moreover, the effects of micro-parameters of DEM sample on the constitutive behaviors are discussed. The results indicate that, when other parameters remain constant, the peak strength of the sample increases with the contact stiffness and the contact bond strength at relatively low strain and high axial strain, respectively, that large friction coefficient may result in high peak strength, and that the peak strength increases with the parallel bond radius and the softening phenomenon of the stressstrain curve becomes more marked.

Key words: asphalt mixture, discontinuous character, discrete element method, uniaxial compression test, stress-strain curve