Abstract
The purpose of this study is to conduct a maximum and minimum densities test and a consolidation drained triaxial test, utilizing materials one of whose particle size, grain size distribution and grain shape is independently different, and to explicate how the primary properties of granular materials influence their void ratio and shear characteristics. The result is that the void ratio, the shear strength, and the dilatancy characteristics are greatly affected by the difference of grain shapes, but not much influenced by the particle size and grain size distribution. However, the modulus of deformation indicating the rigidity in the early stage of the shearing is uniquely determined by the volume decrease potential, irrespective of any one of the primary properties.