ABSTRACT
This study presents the effect of stress-dilatancy modeling on the granular flow response, with a particular focus on the failure surface propagation, free surface evolution and depositional characteristics in terms of run-out distance and residual height. Smoothed Particle Hydrodynamics (SPH) based granular column collapse simulations have been carried out employing non-associative Drucker-Prager (DP) constitutive model. It is to be noted that the non-associative DP model, in its conventional form, does not allow the volumetric strain to attain a zero value at the critical state, which is imperative for large deformations associated with granular flows. Nguyen et.al. (2020) adopted a modified version of non-associative DP model, where a scaling factor was employed to reduce the dilatancy angle with the accumulated plastic strain. In this study, both the forms of non-associative DP model have been considered and the importance of selecting appropriate stress-dilatancy relation with reference to modelling the granular flow phenomena has been highlighted.
