Dilatancy of Coarse Aggregates and Its Modeling Based on Micro Theory

Abstract:

Based on principles of energy conservation and energy minimum ratio proposed by Rowe, the dilatancy equation considering particle breakage was established on micro level. In order to verify the correctness of dilatancy equation, the corresponding elastic plastic constitutive model was set up by introducing the modified hardening rule. Then the numerical simulation of triaxial tests about two different shape coarse granular aggregates was carried out. Results show that this model can accurately describe the dilatancy characteristic and stress strain relationship of coarse granular aggregates.

Key words:dilatancy; particle breakage; coarse granular aggregates; micro theory; constitutive model