Rheological Behaviour Of Pyroclastic
Debris Flow
Author(s)
A. M. Pellegrino1, A. Scotto di Santolo, A. Evangelista
& P. Coussot
Abstract
The pyroclastic soils that cover the mountains of the Campania region in Italy
are usually unsaturated and collapse due to rainfall infiltration triggering
landslides. The evolution of these soils after collapse is not well understood.
Indeed, their post-failure behaviour may be \“solid-like” or \“fluid-like”,
depending on causes that are not well known. The objective of this paper is the
study carried out on the rheological behaviour of the \“fluid-like” pyroclastic
material with fluid mechanics tools: a vane rotor rheometer and an inclined
plane. Two natural pyroclastic deposits have been sampled and different
soils-water mixtures have been analysed. The main results have been explained
and discussed
Keywords: debris flow, pyroclastic soil, solid-liquid transition, rheology,
laboratory activity, fluids model, yield stress, critical shear rate.
1 Introduction
The Campania region has been covered by pyroclastic deposits generated by
different volcanic centres, the most famous of which is the Somma-Vesuvius,
which is still active inside the so-called Campanian Volcanic Zone. In this area,
pyroclastic soils (mostly ash and pumices) and soft rocks (tuff) have been
extensively used since antiquity for construction purposes. The cover is
cohesionless and poses severe slope stability problems. The landslides have been
classified as translational or rotational sliding or falls that lead to debris flows.
As a result of the ceaseless growth and spreading of urbanised areas and
Keywords
debris flow, pyroclastic soil, solid-liquid transition, rheology,
laboratory activity, fluids model, yield stress, critical shear rate
Related Book
Other papers in this volume
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