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TitreFailure mechanism of an ancient sensitive clay landslide in eastern Canada
AuteurWang, B
SourceLandslides 2019 p. 1-13, https://doi.org/10.1007/s10346-019-01198-4
Année2019
Séries alt.Ressources naturelles Canada, Contribution externe 20180294
ÉditeurSpringer Science and Business Media LLC
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/s10346-019-01198-4
Mediapapier; en ligne; numérique
Formatspdf (Adobe® Reader®); html
ProvinceQuébec
SNRC31G/05
Lat/Long OENS -76.0000 -75.7500 45.5000 45.4167
Sujetsglissements de terrain; dépôts de glissement de terrain; sédiments marins; argiles marins; argiles sensibles; secousses séismiques; analyses de la stabilité des pentes; glissements de pentes; modèles; eaux de surface; rivières; cours d'eaux; essais de cisaillement; resistance au cisaillement; trous de mine; échantillons carrotés; repartition granulométrique; plasticité; analyses de limite de liquidité; pressions interstitielles; Holocène; Holocène; Sédiments de Champlain Sea ; atténuation; géologie des dépôts meubles/géomorphologie; géologie de l'ingénieur; géophysique; Phanérozoïque; Cénozoïque; Quaternaire
Illustrationslocation maps; geoscientific sketch maps; tables; plots; profiles; cross-sections; models
ProgrammeRisques géologique du tremblement de terre, Géoscience pour la sécurité publique
Diffusé2019 05 22
Résumé(disponible en anglais seulement)
This paper presents a geotechnical study of a Champlain Sea clay landslide at Breckenridge, Quebec, Canada. Previous studies have interpreted the landslide as triggered by an earthquake occurred about 1020 cal years BP. The current study is to estimate the minimum ground acceleration required to trigger the landslide as part of an effort to further understand the earthquake. The study consists of field and laboratory testing and slope stability analysis. Considerable evidences are presented to understand the slope failure mechanism. The result indicates a minimum horizontal ground acceleration of 0.28 g occurred at the site. Most importantly, the paper provides a case history for better understanding landslide hazards associated with sensitive clay failures in the region. Particularly, the study finds that the landslide is a 'flake' type failure as opposed to a retrogressive failure commonly perceived for Champlain Sea clay landslides. It brings to light the 'flake' slide as an important factor to consider for improvement of the current predictive models for sensitive clay failures. It also shows that earthquake-triggered 'flake' slide can be much larger than retrogressive failures in the same settings. The case history may therefore help as a reference for improved mitigative measures.
Résumé(Résumé en langage clair et simple, non publié et disponible en anglais seulement)
This paper presents results of a geotechnical study of a Leda clay landslide in eastern Canada. The landslide was triggered by an earthquake about a thousand years ago. The study is to reconstruct the slope and to simulate the slope failure. Leda clay is known to be sensitive to disturbance. Once a failure starts in a small area, such as at a river bank, it may continue to fail progressively inland to a large distance - the so called retrogressive failure. This failure process has been the focus of sensitive clay landslide studies for decades. However, this study unveiled a different slope failure process. Numerous evidences indicate that a sensitive clay landslide can happen instantly over a distance that can be much greater than the typical retrogressive failures. This finding helped reconstruct the slope model. The estimated threshold ground acceleration is consistent with other observations. The results enhanced the knowledge about the region's landslide and earthquake hazards.
GEOSCAN ID313095