Residual Shear Strength Measured by Laboratory Tests and Mobilized in Landslides

AbstractDrained 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 th...

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Bibliographic Details
Published in:Journal of geotechnical and geoenvironmental engineering 2012-05, Vol.138 (5), p.585-593
Main Authors: Mesri, Gholamreza, Huvaj-Sarihan, Nejan
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Clays
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Friction
Geotechnics
Laboratory tests
Landslides
Natural hazards: prediction, damages, etc
Shale
Shear
Shear strength
Shear stress
Soil mechanics. Rocks mechanics
Technical Papers
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Summary:AbstractDrained 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
1943-5606
DOI:10.1061/(ASCE)GT.1943-5606.0000624