Mechanical Properties and Deformation Characteristics of Single Graded Rockfill Materials

Particle gradation is one of the main factors that affect the mechanical properties of rock-fill materials. To study the mechanical properties and deformation characteristics of the rock-fill materials with single particle size, the large-scale triaxial test and numerical simulation of particle flow were conducted. The main results are as follows: in the case of dense state, the shear contraction of the sample occurs, and the specimen presents the strain hardening model, which shows the opposite rule of the conventional coarse aggregate or sand materials. When the confining pressure is same, and axial strain is identical, the shear contraction of grain with small particle size is more obvious than that of large particle size. When the condition is the same, the deviatoric stress of large particle is larger than small particle's. At the same time, it is found that the particle size of the single graded rockfill materials will have an important influence on its mechanical properties and deformation characteristics.