An Investigation of Angle of Repose and Surface Activity of a Conical Bead Pile

David Morrow


Slip avalanches are investigated on a conical pile built from uniform steel beads. The pile is driven by the addition of steel beads to the top of the pile one at a time. To better understand the dynamic motion of avalanches, we investigated the change in angle of repose of the bead pile. The change in angle of repose was studied as a function of avalanche size as well as cohesion levels. It was found that increased cohesion tends to increase the change in angle of repose regardless of size of the avalanche. To further understand avalanche dynamics, we used video analysis of the surface of the pile. The relationship between surface activity and the change in angle of repose is under investigation. Avalanche depth has been proposed as a possible factor that affects angle of repose.