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A thermo-mechanical model for the catastrophic collapse of large landslides

A thermo-mechanical model for the catastrophic collapse of large landslides
A thermo-mechanical model for the catastrophic collapse of large landslides
In this work, a new thermo-mechanical model is developed, applicable to large-scale, deep-seated landslides consisting of a coherent mass sliding on a thin clayey layer. The considered time window is that of catastrophic acceleration, starting at incipient failure and ending when the acquired displacement and velocity are such that the sliding material begins to break up into pieces. The model accounts for temperature rise in the slip zone due to the heat produced by friction, leading to water expansion, thermoplastic collapse of the soil skeleton, and subsequent increase of pore water pressure. The model incorporates the processes of heat production and diffusion, pore pressure generation and diffusion, and an advanced constitutive law for the thermo-mechanical behavior of soil. An analysis of the Vajont landslide is presented as an example. A sensitivity analysis shows that friction softening is the mechanism most affecting the timescale of the final collapse of a slide, but also that the mechanism of thermal pressurization alone can cause a comparably catastrophic dynamic evolution. It is also shown that, all other factors being equal, thermo-mechanical collapse will cause thicker slides to accelerate faster than shallow ones.
thermal pressurization, constitutive modeling, landslide dynamics, numerical analysis, thermo-mechanics
1096-9853
1507-1535
Cecinato, F.
39ce6c19-7429-465e-a769-d9b500a496e6
Zervos, A
9e60164e-af2c-4776-af7d-dfc9a454c46e
Veveakis, E
065ce1ea-3c3b-4965-87b5-6840a8f7961a
Cecinato, F.
39ce6c19-7429-465e-a769-d9b500a496e6
Zervos, A
9e60164e-af2c-4776-af7d-dfc9a454c46e
Veveakis, E
065ce1ea-3c3b-4965-87b5-6840a8f7961a

Cecinato, F., Zervos, A and Veveakis, E (2010) A thermo-mechanical model for the catastrophic collapse of large landslides. International Journal for Numerical and Analytical Methods in Geomechanics, 35, 1507-1535. (doi:10.1002/nag.963).

Record type: Article

Abstract

In this work, a new thermo-mechanical model is developed, applicable to large-scale, deep-seated landslides consisting of a coherent mass sliding on a thin clayey layer. The considered time window is that of catastrophic acceleration, starting at incipient failure and ending when the acquired displacement and velocity are such that the sliding material begins to break up into pieces. The model accounts for temperature rise in the slip zone due to the heat produced by friction, leading to water expansion, thermoplastic collapse of the soil skeleton, and subsequent increase of pore water pressure. The model incorporates the processes of heat production and diffusion, pore pressure generation and diffusion, and an advanced constitutive law for the thermo-mechanical behavior of soil. An analysis of the Vajont landslide is presented as an example. A sensitivity analysis shows that friction softening is the mechanism most affecting the timescale of the final collapse of a slide, but also that the mechanism of thermal pressurization alone can cause a comparably catastrophic dynamic evolution. It is also shown that, all other factors being equal, thermo-mechanical collapse will cause thicker slides to accelerate faster than shallow ones.

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More information

Published date: 24 September 2010
Keywords: thermal pressurization, constitutive modeling, landslide dynamics, numerical analysis, thermo-mechanics
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 185599
URI: https://eprints.soton.ac.uk/id/eprint/185599
ISSN: 1096-9853
PURE UUID: fab5b610-33fc-4083-9d5d-4453baa26727
ORCID for A Zervos: ORCID iD orcid.org/0000-0002-2662-9320

Catalogue record

Date deposited: 10 May 2011 15:45
Last modified: 19 Jul 2019 00:58

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