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Modélisation physique tridimensionnelle des mouvements gravitaires de grande ampleur en milieu rocheux.

Abstract : Gravity is one of the principal forces controlling the evolution of mountain belts. The best known effects are various forms of landslides. However, gravity also causes movements over larger spatial and temporal scales, the effects of which are difficult to distinguish from tectonic structures or are hidden by erosion. These movements are known as Deep Seated Gravitational Slope Deformation (DSGSD). Understanding this phenomenon is therefore important, both from structural and geomorphological points of view and for the prediction of natural hazards. Yet the mode of rupture that causes these movements rests unknown due to the lack of observations at depth.
We have studied this phenomenon using a 3D experimental physical modelling approach. The first objective was to finalise the recently-developped experimental protocole. This method is based on the use of new analogue materials and an original experimental gravity loading device which allows tests to be carried out respecting the physical similarity criteria. The protocol also has the advantage of allowing the observation of incremental deformation, as well as obtaining cross-sections through the model to study deformation at depth. The study shows that the maximum depth of the rupture surface is of the same order as the height of the slope affected. Furthermore, during the evolution of the rupture, deep-seated phenomena help trigger gravity movements at a smaller scale. The larger-scale topography was also shown to be a major factor controlling the geometry and distribution of gravity movements.
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Contributor : Damien Bachmann <>
Submitted on : Friday, February 23, 2007 - 6:19:59 PM
Last modification on : Tuesday, May 26, 2020 - 6:50:42 PM
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  • HAL Id : tel-00133173, version 1

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Damien Bachmann. Modélisation physique tridimensionnelle des mouvements gravitaires de grande ampleur en milieu rocheux.. Sciences de la Terre. Université Nice Sophia Antipolis, 2006. Français. ⟨tel-00133173⟩

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