Scaling of granular column collapses on inclined planes

TL;DR

This study introduces a new dimensionless number to describe the run-out behavior of granular columns on inclined planes, supported by DEM simulations and analysis of initial and boundary conditions, linking to natural hazards and industrial processes.

Contribution

It proposes a novel dimensionless parameter for granular column collapse on inclined planes, validated through DEM simulations and comprehensive analysis of influencing factors.

Findings

The new dimensionless number effectively characterizes run-out distances.

Granular collapses on inclined and horizontal planes share similar behaviors.

Initial and boundary conditions significantly influence collapse dynamics.

Abstract

Granular column collapse is a simple but important problem to the granular material community, due to its links to dynamics of natural hazards, such as landslides and pyroclastic flows, and many industrial situations, as well as its potential of analyzing transient and non-local rheology of granular flows. This article proposes a new dimensionless number to describe the run-out behaviour of granular columns on inclined planes based on both previous experimental data and dimensional analysis. With the assistance of the sphero-polyhedral discrete element method (DEM), we simulate inclined granular column collapses with different initial aspect ratios, inter-particle frictions, and initial solid fractions on inclined planes with different inclination angles (2.5$^{\circ}$ - 20.0$^{\circ}$) to verify the proposed dimensional analysis. Detailed analyses are further provided for better understanding of the influence of different initial conditions and boundary conditions, and to help unify the description of the relative run-out distances of systems with different inclination angles. This work determines the similarity and unity between granular column collapses on inclined planes and those on horizontal planes, and helps investigate the transient rheological behaviour of granular flows, which has direct relevance to various natural and engineering systems.