Rôle de la thermique dans la prédisposition, la préparation et le déclenchement des mouvements de versants complexes : exemple des Rochers de Valabre (Alpes-Maritimes)

Abstract : The present dissertation describes a rockfall that has affected the Rochers de Valabres slope and discusses one possible mechanism for its occurrence, along with the potential for future ones. ln the absence of an obvious explanatory trigger factor, we set out to examine whether natural daily surface temperature changes could have played a role in this event. ln particular, it is suspected that these slight, yet repeated, perturbations may be a preparatory factor for rockfalls, with a day-to-day cumulative effect. A numerical model strengthens this hypothesis by showing that thermally-induced deformations can be sufficient to cause the graduai downward creep of rock blocks located in an awkward position. To investigate this notion more thoroughly, a currently-vulnerable part of the slope has been instrumented with a high-precision geodetic monitoring system to capture thermally-induced movements. Measured data are compared herein with numerical modelling results.
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Yann Gunzburger. Rôle de la thermique dans la prédisposition, la préparation et le déclenchement des mouvements de versants complexes : exemple des Rochers de Valabre (Alpes-Maritimes). Autre. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL119N⟩. ⟨tel-01749751⟩

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