Fourth Canadian Geotechnical Colloquium: Strength and slope stability in Canadian soft clay deposits

Lefèbvre, Guy

doi:10.1139/t81-047

Cited by 106 publications

(42 citation statements)

References 14 publications

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“…These values correspond to mobilized strength parameters obtained by Lefebvre (1981) on eastern Canadian clays for range of reconsolidation stresses of 5-20 kPa and a p value of 120 kPa. Lefebvre (1981) showed that these values are empirical but representative of the soil near and above the elevation of the toe of the slope that is overconsolidated and could be involved in a first time landslide. They take into account different factors, including progressive failure.…”

Section: Stability Of Slope Before Failuresupporting

confidence: 79%

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

et al. 2015

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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.Key words: progressive failure, spread, sensitive clay, large-deformation shear strength, brittleness.Résumé : Un glissement de terrain est survenu en 1994 dans la municipalité de Sainte-Monique, Québec. Les débris présentaient des formes de horsts et grabens typiques des étalements dans les argiles sensibles. L'investigation géotechnique démontre que le sol impliqué dans ce glissement est une argile silteuse grise normalement consolidée, sensible, de forte plasticité et ayant une consistance ferme à raide. Ce sol présente une sensibilité et une fragilité lors du cisaillement élevées et peut donc être susceptible à la rupture progressive. Les analyses de stabilité traditionnelles n'arrivent pas à expliquer ce glissement. Ceci offre donc l'opportunité d'examiner l'application du concept de la rupture progressive sur cet étalement. À l'aide de programmes d'éléments finis, il est démontré que l'initiation et l'étendue de la surface de rupture observée peuvent être expliquées par un sol ayant une grande fragilité lors du cisaillement et une résistance à grandes déformations près de la résistance du sol remanié. La dislocation de la masse de sol en horsts et grabens est expliquée par la rupture active survenant dans la masse de sol au-dessus de la surface de rupture pendant ou peu après la propagation de la rupture. Il est donc démontré numériquement que la rupture progressive explique l'initiation et l'étendue de la surface de rupture d'un étalement.

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Section: Stability Of Slope Before Failuresupporting

confidence: 79%

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

et al. 2015

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“…The shear strength parameters used in the drained stability analysis are based on pre-consolidation pressure, as suggested by Lefebvre (1981). Cohesion and friction angle values used for each unit are presented in Table 1.…”

Section: Stability Analysismentioning

confidence: 99%

The Saint-Jude landslide of 10 May 2010, Quebec, Canada: Investigation and characterization of the landslide and its failure mechanism

Locat

Demers

et al. 2017

Can. Geotech. J.

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A landslide occurred on 10 May 2010, along the Salvail River, in the municipality of Saint-Jude, Quebec. Debris of the landslide was formed of 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 was 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 the location of two failure surface levels: the first one starting 2.5 m below the initial river bed, 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.

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“…Currently, different strength functions have been proposed to describe the nonlinear strength characteristics for soils, such as the bilinear function [22], trilinear function [23], simple power function [24][25][26][27], and generalized power function [28]. e generalized power function presented by Baker [28] was utilized to fit the measured data in this study as follows:…”

Section: Shear Strength Characteristic Of Natural Expansivementioning

confidence: 99%

Surficial Failure of Expansive Soil Cutting Slope and Its Flexible Support Treatment Technology

Xiao

Yang

Zhang

et al. 2018

Advances in Civil Engineering

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e surficial failure of most expansive soil cutting slopes, subjected to the repeated wet-dry cycles, often occurs during or after rainfall following a long drought. e reason for this, however, is still unclear. erefore, the laboratory tests were conducted to gain the saturated drained shear strength of the natural Nanning expansive soil considering the combined effects of swelling with loading and wet-dry cycles. e findings indicate that the envelope of shear strength, which significantly drops close or equal to zero, can be well fitted by the generalized power function. At the same time, the effect of shear strength parameters on the stability of the expansive soil cutting slope was investigated. e reasons for the shear strength attenuation of the natural expansive soil and the surficial failure of the expansive soil cutting slopes were analyzed. It is evident that the effective cohesion being small is a vital factor influencing the occurrence of surficial failure of an expansion soil slope. Moreover, an effective flexible support treatment measure was provided.

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Fourth Canadian Geotechnical Colloquium: Strength and slope stability in Canadian soft clay deposits

Cited by 106 publications

References 14 publications

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

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

The Saint-Jude landslide of 10 May 2010, Quebec, Canada: Investigation and characterization of the landslide and its failure mechanism

Surficial Failure of Expansive Soil Cutting Slope and Its Flexible Support Treatment Technology

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