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Robitaille, Denis

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Université Laval. Faculté de foresterie, de géographie et de géomatique
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  • Publication
    Accès libre
    The Saint-Jude landslide of May 10th, 2010, Quebec, Canada : investigation and characterisation of the landslide and its failure mechanism
    (Ottawa National Research Council of Canada, 2017-09-26) Locat, Pascal; Locat, Ariane; Robitaille, Denis; Leroueil, Serge; Demers, Denis; Lefebvre, Guy
    A landslide occurred on May 10, 2010, along the Salvail River, in the municipality of Saint- Jude, Quebec. Debris of the landslide was formed of blocks clay having horst and graben shapes, typical of spreads in sensitive clays. A detailed investigation was carried out by the Ministère des Transports, de la Mobilité durable et de l’électrification des transports du Québec in collaboration with Université Laval, with the objective of characterizing this landslide, determining the causes and learning about its failure mechanism. The soil involved is a firm, grey, sensitive lightly overconsolidated clay with some silt. Data from piezometers installed near the landslide indicated artesian conditions underneath the Salvail River. Cone penetration tests allowed to location of two failure surface levels. The first one starting 2.5 m below the initial river bed and extending horizontally up to 125 m and a second one 10 m higher reaching the backscarp. Investigation of the debris with onsite measurements, light detector and ranging surveys, cone penetration tests, and boreholes allowed a detailed geotechnical and morphological analysis of the debris and reconstitution of the dislocation mechanism of this complex spread.