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Residual shear strength measured by laboratory / Gholamreza Mesri in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 585–593 Titre : Residual shear strength measured by laboratory : Tests and mobilized in landslides Type de document : texte imprimé Auteurs : Gholamreza Mesri, Auteur ; Nejan Huvaj-Sarihan, Auteur Année de publication : 2012 Article en page(s) : pp. 585–593 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Clays  Shales  Residual  strength  Landslides  Slope  stability Résumé : Drained residual shear strength measured by multiple reversal direct shear or ring shear tests has been successfully used for over four decades for stability analyses of reactivated landslides in stiff clays and clay shales; A body of literature has accumulated in recent decades, claiming that “healing” or “strength regain” is realized in time on preexisting slip surfaces already at residual condition. In other words, the shear stress required to reactivate a landslide is claimed to be larger than the drained residual shear strength determined using laboratory tests. This article presents (1) a comparison of secant residual friction angle determined from laboratory tests and secant mobilized friction angle back-calculated for reactivated landslides; (2) explanations that field evidence used to claim “healing” can be attributed to alternative factors, and the laboratory evidence on “strength regain” upon reshearing is the result of either the testing apparatus or testing procedure, or is inapplicable to stiff clays and shales; and (3) laboratory aging test results, which show no “strength regain” on preexisting shear surfaces at residual condition. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000624 [article] Residual shear strength measured by laboratory : Tests and mobilized in landslides [texte imprimé] / Gholamreza Mesri, Auteur ; Nejan Huvaj-Sarihan, Auteur . - 2012 . - pp. 585–593. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 585–593 Mots-clés : Clays  Shales  Residual  strength  Landslides  Slope  stability Résumé : Drained residual shear strength measured by multiple reversal direct shear or ring shear tests has been successfully used for over four decades for stability analyses of reactivated landslides in stiff clays and clay shales; A body of literature has accumulated in recent decades, claiming that “healing” or “strength regain” is realized in time on preexisting slip surfaces already at residual condition. In other words, the shear stress required to reactivate a landslide is claimed to be larger than the drained residual shear strength determined using laboratory tests. This article presents (1) a comparison of secant residual friction angle determined from laboratory tests and secant mobilized friction angle back-calculated for reactivated landslides; (2) explanations that field evidence used to claim “healing” can be attributed to alternative factors, and the laboratory evidence on “strength regain” upon reshearing is the result of either the testing apparatus or testing procedure, or is inapplicable to stiff clays and shales; and (3) laboratory aging test results, which show no “strength regain” on preexisting shear surfaces at residual condition. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000624