The stress-strain relationship

strength and particle breakage properties of coarse aggregates under high and low confining pressures are analyzed detailedly. The influence of the content of mudstone on the strength behavior of rockfill is also studied. Test results indicate that under high confining pressures coarse aggregates are characterized by strain hardening and volumetric compression

Mohr-Coulomb envelope and relationship between peak principal stress ratio and dilatancy approximate to linear

while under low confining pressures they exhibit strain softening

volumetric dilatancy and nonlinear respectively. With the increasing of confining pressure principal stress ratio and internal friction angle decrease

while particle breakage index increases. The increasing content of mudstone results in the decrease of rockfill strength.