Dynamics of quasi-static collapse process of a binary granular column

TL;DR

This study systematically investigates the quasi-static collapse of a binary granular column, revealing distinct sliding and static zones, and develops a dynamical model that accurately predicts particle trajectories during collapse.

Contribution

It introduces an experimental setup for controlled quasi-static collapse and a dynamical model that matches observed particle trajectories in a binary granular column.

Findings

Identification of sliding and static regions within the column

Development of a trajectory prediction model

Experimental validation of the model's accuracy

Abstract

The dynamical behavior of the column that made up binary granular beads is investigated systematically by tracking the displacement of particles in the collapse process. An experimental setup is first devised to control the quasi-static collapse of a granular column, and then observe the trajectories of tracer particles by using an industrial camera controlled by the image acquisition program. It is found that there exist two zones in column: a sliding region in which particles are moving in a layered structure; a static region within which particles are stationary. According to this analytical result, a dynamical model is developed to predict the trajectory evolution of particles in the space-time. The calculating result for the trajectories of particles on the selected layers is well consistent with the experimental observation.