Where does a cohesive granular heap break?
Laboratoire de physique des solides, UMR CNRS 8502, Bat. 510, Campus universitaire, 91405, Orsay Cedex, France
2 Laboratoire physique de la matiére condensée et nanostructures, UMR CNRS 5586, Université Lyon I, 43, Bd du 11 Novembre 1918, 69622, Villeurbanne Cedex, France
In this paper, we consider the effect of cohesion on the stability of a granular heap and compute the maximum angle of stability of the heap as a function of the cohesion. We show that the stability is strongly affected by the dependence of the cohesion on the local pressure. In particular, this dependence is found to determine the localization of the failure plane. While for a constant adhesion force, slip occurs deep inside the heap, surface failure is obtained for a linear variation of the cohesion on the normal stress. Such a transition allows to interpret some recent experimental results on cohesive materials.
© EDP Sciences, Società Italiana di Fisica, and Springer-Verlag, 2004