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.
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•The quasi-static collapse process of a binary granular system is first experimentally studied.•The boundary-layer separates granular column into the static zone and the sliding zone.•The dynamic model can quantitatively predict the slipping angle and the slippage of any particle.•The experimental result is in good agreement with the theoretical calculation.