LIMITATIONS OF KINEMATIC HARDENING FOR MODELING SOIL BEHAVIOR

摘要

Modeling soil behavior during large stress reversals and modeling cross-anisotropic soil behavior may be done by models formulated in terms of stress invariants and incorporating combinations of isotropic and rotational kinematic hardening. They seem to capture the soil behavior observed in triaxial compression and cubical triaxial tests with good accuracy. Incorporation of measured behavior during large stress reversals in torsion shear tests into the kinematic hardening model has proved to be problematic. In fact, the attempt to include effects of stress rotation in the rotational kinematic model has illuminated why these types of models do not capture all aspects of soil behavior, and why the concepts behind the kinematic hardening models, whether translational or rotational, will not be able to correctly predict soil behavior under general stress conditions, as required in a finite element or finite difference setting.