Abstract: 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.