MODELING RHEOLOGICAL PROPERTIES OF MATERIALS FOR ROCKFILL DAMS

摘要

The focus of this paper is on modeling the essential mechanical properties of moisture sensitive weathered coarse-grained rockfill materials using a hypoplastic constitutive model. The model is based on the current void ratio, the effective stress, a moisture dependent granular hardness and the rate of deformation. Creep and stress relaxation during the time-dependent process of degradation of the granular hardness are also taken into account. The calibration of the model is performed for weathered broken granite and the performance of the model is demonstrated for a triaxial compression test. The prediction of the model is compared with the corresponding experimental results.