Author(s)

A. Scotto di Santolo, A. M. Pellegrino & A. Evangelista

Abstract

The rheological behaviour of the natural material collected in the source area of three debris flows occurring in the mountainsides of the North-western Campania region (southern Italy) has been investigated. The tests have been carried out at different solid volumetric concentration Cv with a standard rheometer equipped with two geometric configurations to avoid disturbing effects. All materials behave like a Non-Newtonian fluid with a threshold shear stress τy (yield stress) that increases with solid volumetric concentration. The experimental data have been fitted with standard model generally used for fluids. A simple relation between Cv and τy has been obtained. Keywords: rheology, debris flow, pyroclastic soils, laboratory activity, fluids model, yield stress.

Keywords

rheology, debris flow, pyroclastic soils, laboratory activity, fluids model, yield stress