A series of large-scale consolidated drained triaxial tests were conducted to research particle breakage of Zipingpu rockfill material under monotonic and cyclic loading for different initial void ratios. The results show that there exists a hyperbolic relation between the input plastic work and particle breakage

regardless of the initial void ratio or confining pressure under both monotonic and cyclic loading. The dilatancy factor at peak decreases with the increasing of particle breakage and there exists a nearly linear relation between particle breakage at peak and the dilatancy factor at peak on semilog coordinate

irrespective of initial void ratio. Test results in this study also indicate that there exists an approximate linear relation between peak principal stress ratio and the dilatancy factor at peak

regardless of the initial void ratio. This study results can provide useful references for state-dependent elastic-plastic constitutive model considering particle breakage and finite element analysis of Zipingpu concrete face dam during Wenchuan earthquake; and help to further understand the particle breakage of rockfill materials.