Triaxial tests on particle breakage strain of artificial rockfill materials

Particle breakage of rockfill materials is serious under high pressure,and its influence on deformation of rockfill cannot be ignored.A method is presented to make artificial rockfill materials with ellipse-shaped particles,which are moulded in various sizes and strengths with cement pastes.Based on a series of triaxial tests,the behaviour of stress-strain and breakage volumetric strain of artificial rockfill materials is analyzed.The test results show that the relative breakage is correlative to the particle strength and confining pressure.The stress-strain behaviour of rockfill is seriously influenced by the particle breakage.The breakage volumetric strain of rockfill is positive and increases with the increase of axial strain in a trend of hyperbolic curve.The relationship between the breakage volumetric strain and the relative breakage can be fitted by a power function.