The 1994 landslide at Sainte-Monique, Quebec: geotechnical investigation and application of progressive failure analysis

Author:

Locat A.1,Leroueil S.1,Fortin A.2,Demers D.2,Jostad H.P.3

Affiliation:

1. Département de génie civil et de génie des eaux, Université Laval, Pavillon Adrien-Pouliot, 1065, avenue de la Médecine, Québec, QC G1V 0A6, Canada.

2. Section des mouvements de terrain, Service de la géotechnique et de la géologie, Ministère des Transports du Québec, 930, chemin Sainte-Foy, 2e étage, Québec, QC G1S 4X9, Canada.

3. Norwegian Geotechnical Institute, P.O. Box. 3930, Ullevål Stadion, N-0806 Olso, Norway.

Abstract

In 1994, a landslide occurred in the municipality of Sainte-Monique, Quebec. The debris of the landslide had graben and host shapes, typical of spreads in sensitive clays. The geotechnical investigation shows that the soil involved is a firm to stiff, sensitive, nearly normally consolidated grey silty clay of high plasticity. This soil exhibits a high sensitivity and a high brittleness during shear and is therefore susceptible to progressive failure. Traditional stability analysis cannot explain this landslide. This gives the opportunity to examine the applicability of progressive failure analysis to this spread. Using the finite elements method, it is demonstrated that the initiation and observed extent of the failure surface are explained by a soil having high brittleness during shear and a large-deformation shear strength close to the remoulded shear strength of the soil. The dislocation of the soil mass can also be explained by the active failure occurring in the soil mass above the failure surface during or shortly after failure propagation. It is therefore numerically demonstrated that progressive failure explains the initiation and the extent of the failure surface of this spread.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

Reference23 articles.

1. Andresen, L., and Jostad, H.P. 2004. Analyses of progressive failure in long natural slopes. In Proceedings of the 9th Symposium on Numerical Models in Geomechanics - NUMOG IX, 25-27 August 2004, Ottawa, Canada, Ont. A.A. Balkema, Leiden, the Netherlands, pp. 603–608. 10.1201/9781439833780.ch85

2. Bernander, S. 2000. Progressive landslides in long natural slopes, formation, potential extension and configuration of finished slides in strain-softening soils. Licentiate thesis, Department of Civil and Mining Engineering, Luleå University of Technology, Luleå, Sweden.

3. Bernander, S. 2011. Progressive landslides in long natural slopes, formation, potential extension and configuration of finished slides in strain-softening soils. Ph.D. thesis, Department of Civil and Mining Engineering, Luleå University of Technology, Luleå, Sweden.

4. Stability of Natural Slopes in Quick Clay

5. On the retrogression of landslides in sensitive muddy sediments

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