On the vertical rotation of a sand heap

Resumen

This work is a phenomenological attempt to predict the dynamic response of a sandheap due to rotation about its vertical axis. We have made experiments and we've developed a model in order to describe the effect of the rotation on the pile's surface from a dimensionless force balance equation using the Coulomb yield law. We got a very good correspondence between the experimental patterns and the theory, depending on the material through the solid friction angle and we formulated a plausible suggestion for the way in which the pile's history is determined by dynamic (Fraude number) and material friction coefficient) parameters.