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Downhill Progressive Landslides in Long Natural Slopes: Triggering Agents and Landslide Phases modeled with a Finite Difference Method
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
Skanska Teknik, Göteborg, Chalmers University of Technology.
Multiconsult, Norwegian University of Science and Technology (NTNU), Trondheim.
Statens Geotekniska Institut, Linköping, PEB Geoteknik.
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Number of Authors: 8
2016 (English)In: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010Article in journal (Refereed) Epub ahead of print
Abstract [en]

A large landslide in Tuve (Gothenburg, Sweden 1977) initiated the development of a model for slope stability analysis taking the deformation-softening of soft sensitive clays into consideration. The model studies triggering agents and five phases in progressive slope failure are identified: (1) in-situ, (2) disturbance, (3) unstable ‘dynamic’, (4) transitory (or permanent) equilibrium, and (5) ‘global’ failure. The clay resistance in these phases may differ widely; mostly due to different rates of loading. Two time dependent failure criteria are defined: (i) the triggering load condition in the disturbance Phase (2), and (ii) the transitory equilibrium in Phase (4), indicating whether minor downhill displacements or a veritable landslide catastrophe will occur. The analysis explains why downhill landslides tend to spread over vast areas of almost horizontal ground further down-slope. The model has been applied to landslides in Scandinavia and Canada. Three case studies are briefly discussed. The model is a finite difference approach, where local downhill deformations caused by normal forces is maintained compatible with deviatory shear deformations above the potential (or the established) failure surface. Software and an easy-to-use spreadsheet are introduced as well as recent developments. See also Video Abstract.

Place, publisher, year, edition, pages
Keyword [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Progressiva skred, Defoemationsmjuknande material, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering Infrastructure Engineering
Research subject
Soil Mechanics; Structural Engineering; Attractive built environment (AERI)
URN: urn:nbn:se:ltu:diva-8899DOI: 10.1139/cgj-2015-0651Local ID: 7728f175-24d8-44ef-9bc4-cedb0060ee63OAI: diva2:981837

Upprättat; 2016; Nivå 2; Bibliografisk uppgift: An updated summary of Stig Bernanders Ph D Thesis from 2011; 20160603 (elfgren)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2016-10-10

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Bernander, StigPusch, RolandKnutsson, SvenElfgren, Lennart
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