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Theses

Modélisations des glissements de terrain comme un problème de bifurcation

Abstract : Natural disasters are becoming increasingly more frequent and are causing both human suffering as well as hampering economic development. The forecast of these risks, notably with regard to catastrophic landslides, is consequently an essential need. In this context, the numerical modelling must be pertinent and capable of predicting real phenomena. Nowadays, some landslides with low (less than 14°) to very low (less than 8°) slope angles, where the failure is often of the diffuse type, can be explained using neither classical empirical methods nor traditional limit analyses (plasticity theories). New approaches are necessary in order to account for these mechanisms of landslides. The Hill's sufficient condition of stability based on the sign of second order work seems to be a pertinent criterion to analyze these diffuse modes of failure.

This thesis is dedicated on the one hand to the analysis and the implementation of Hill's stability criterion into two finite element codes (LAGAMINE and PLAXIS) and, on the other hand, to their application to the numerical modelling of non-linear boundary problems, more specifically landslides.

The second order work analyses conducted with the incrementally non-linear constitutive models show that certain soils exhibit a large domain of potential instability strictly inside the plasticity limit criterion. These conclusions are corroborated by the experimental results.

In this work, we show, by analytical and numerical approaches within the context of the elastoplastic theory, that Hill's criterion is always fulfilled before the so-called plastic limit condition (Mohr-Coulomb's criterion) and the plastic strain localization criterion (i.e. Rice's criterion).

Using Hill's stability condition, we analyze the landslide that occurred on the Trévoux hillside after an intense rainfall period in 1983. This modelling was undertaken by unsaturated hydro-mechanical coupling.

The same approach was taken for the analysis of the catastrophic massive landslide that occurred at Las Colinas (El Salvador) under earthquake shaking in 2001, by using the pseudo-static method for the definition of the loading.
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https://tel.archives-ouvertes.fr/tel-00085919
Contributor : Dat Vu Khoa Huynh <>
Submitted on : Monday, July 17, 2006 - 12:08:46 PM
Last modification on : Thursday, November 19, 2020 - 3:54:38 PM
Long-term archiving on: : Monday, April 5, 2010 - 10:05:01 PM

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  • HAL Id : tel-00085919, version 1

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Dat Vu Khoa Huynh. Modélisations des glissements de terrain comme un problème de bifurcation. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00085919⟩

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