Analyse multi-méthodes de la déstabilisation d’un pylône de remontée mécanique implanté sur un glacier rocheux des Alpes françaises

Abstract : In the Val Thorens ski resort (Savoie, France), more than 79 infrastructure elements related to ropeway transport systems are located on permafrost. During the last decade, three of them (two top stations and a pylon located around 3,000 m a.s.l.) experienced destabilization which required important adjustment and stabilization work. his study investigates the destabilization of the pylon #2 of the horens funitel that occurred during the Summer 2016. Its foundations were afected by horizontal displacement and subsidence, causing a metric shit of the pylon top with respect to the cable. he pylon was built on a rock glacier which morphology was severely altered by earth work aiming to develop a ski slope. A multidisciplinary analysis was conducted in order to understand the processes that led to the pylon destabilization with a focus on the role of the morphological alterations of anthropogenic origin on the rock glacier dynamic. We used (i) a stratigraphic data analysis from boreholes and (ii) a subsurface analysis based on geophysics (Electrical Resistivity Tomography proiles) to understand the rock glacier internal structure, while (iii) geomorphological surface modiications were investigated by comparing digital terrain models obtained by aerial photogrammetry before and ater the earthwork. his study highlights the preparatory role of the earthwork and a non-control of the surface water low in an ice-rich environment such as a rock glacier.
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Pierre-Allain Duvillard, Ludovic Ravanel, Philippe Schoeneich, Marco Marcer, Jean-François Piard. Analyse multi-méthodes de la déstabilisation d’un pylône de remontée mécanique implanté sur un glacier rocheux des Alpes françaises. Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2019, 25 (1), pp.21-36. ⟨10.4000/geomorphologie.12945⟩. ⟨hal-02350713⟩

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