SIMULATIONS OF IMMATURE DEBRIS FLOW BY LAGRANGE-LAGRANGE MODEL WITH NON-SPHERICAL PARTICLES

Abstract

 Effective debris flow countermeasures require accurate predictions of sediment transport. Constitutive laws of debris flows have been proposed, and recently, theories of sediment transport were validated and modified by the motion of each grain obtained by a developed image analysis technique. However, data measured in laboratory experiments are still limited. In terms of numerical simulations, although Lagrange-Lagrange models have the potential to be applied to unsteady debris flows, there are few previous applications.

 This study used a DEM-MPS scheme to conduct three-dimensional simulations of steady sheet flow (immature debris flow), and the model was comparatively validated from the corresponding laboratory experiments. The simulation with non-spherical elements investigated sphericity effects on frictional/collisional stress, and the stress structure of an immature debris flow was investigated.