Bounding surface plasticity model for stress-strain and grain-crushing
behaviors of rockfill materials
-
Abstract
Crushing of grains can greatly influence the strength, dilatancy, and stress-strain relationship of rockfill materials.
The critical state line (CSL) in the void ratio versus mean effective stress plane was extended to the breakage
critical state plane (BCSP). A state void-ratio-pressure index that incorporated the effect of grain crushing was
proposed according to the BCSP. Rowe’s stress-dilatancy equation was modified by adding the breakage voidratio-
pressure index, which was also incorporated into the formulations of the bounding stress ratio and plastic
modulus. A BCSP-based bounding surface plasticity model was proposed to describe the state-dependent stressstrain
behaviors and the evolution of grain crushing during shearing process of rockfill materials, and was shown
to sufficiently capture the breakage phenomenon.
-
-