Influence of Mixture Composition in the Collapse of Soil Columns Open image in new window
The collapse and consequent spreading of a column of granular or cohesive material is a simple experiment used by many research groups to study the rheology of the soils and for calibrating numerical propagation models. This paper deals with the results of a comprehensive experimental program carried out with mixtures of sand, kaolin and water: the main aim of the program is to know and understand how the mixture composition influences the collapse and run-out mechanism. In particular, the run-out length and the profile of the final deposit are the two fundamental characteristics taken into consideration to distinguish each test and to find a relation with the mixture composition. Four percentages of kaolin and water are considered for the experiments and different amounts of sand are added to these matrices. The main aim is the comprehension of the role of the coarser granular material in a cohesive collapsing mass. Finally, the dependency of the final runout on the aspect ratio of the initial column is discussed.