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DDA(Discontinuous Deformation Analysis),a numerical method used to analyze the discontinuous media,is used to simulate the deformation mechanism of a sand model in this paper.The microscopic mechanism of deformation properties of a sand model such as elasto-plastisity,dilatancy,strain softening,hysteresis loop during unloading-reloading,volume contraction during unloading and formation of shear zone are analyzed and explained by the DDA simulation.The method that takes sand as discontinuous particles provides a powerful approach in the field of soil mechanics.

DISCONTINUOUS DEFORMATION ANALYSIS OF SAND MODEL AND ITS MICROSCOPIC CONSIDERATION