Thermo-mechanical modelling for velocity prediction in catastrophic landslides


Cecinato, F. and Zervos, A. (2008) Thermo-mechanical modelling for velocity prediction in catastrophic landslides. In, Geophysical Research Abstracts volume 10 (Proceedings of the 2008 General Assembly of the European Geosciences Union), Vienna, Austria, 13 - 18 Apr 2008. European Geosciences Union.

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Description/Abstract

Thermal pressurisation has been proposed in literature as the key phenomenon to interpret the mechanics of the final collapse of large slope failures. A new thermomechanical model is proposed by improving on an existing one, applicable to large landslides and rockslides consisting of a coherent mass sliding on a thin clayey layer. The considered time window is that of catastrophic acceleration, which starts at incipient failure and ends a few seconds later, when the acquired displacement and velocity are such that the landslide is broken up into pieces. The model takes into account frictional heating, pore pressure build-up and thermoplastic collapse of the soil skeleton, leading to the vanishing of shear resistance and unconstrained acceleration. First, an existing thermo-elasto-plastic constitutive model for clays is discussed, and modified by re-formulating it in a general stress space and taking into account thermal softening. The soil constitutive model is then employed into an existing 1-D landslide model (Vardoulakis 2002), resulting in a set of three equations describing the time evolution of temperature, excess pore pressures within the shearband and slide velocity. The resulting model equations are shown to be well-posed, and then are discretised and integrated numerically to back-analyse the final stage of the case history of Vajont that occurred in Italy in 1963. Finally, a generalisation of this model and its potential applicability to the velocity back-prediction of other well-documented case histories are discussed.

Item Type: Conference or Workshop Item (Paper)
Related URLs:
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 52721
Date Deposited: 26 Aug 2008
Last Modified: 28 Mar 2014 15:11
Projects:
Unknown (EP/C520556/1)
Funded by: EPSRC (EP/C520556/1)
UNSPECIFIED to UNSPECIFIED
URI: http://eprints.soton.ac.uk/id/eprint/52721

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