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TitleEffects of geometry and soil properties on type and retrogression of landslides in sensitive clays
 
AuthorWang, C; Hawlader, B; Perret, D; Soga, K
SourceGeotechnique vol. 72, issue 4, 2020 p. 322-336, https://doi.org/10.1680/jgeot.20.P.046
Image
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20210406
PublisherICE Publishing
Documentserial
Lang.English
Mediapaper; digital; on-line
File formatpdf
SubjectsScience and Technology; Nature and Environment; geophysics; landslides; deformation
ProgramPublic Safety Geoscience Intraplate Earthquakes
Released2020 12 14
AbstractFlowslide and spread are two common types of landslides in sensitive clays. Empirical criteria, based on single or multiple soil properties and slope geometry, have been proposed for a rough assessment of potential landslide type and retrogression distance. A large variation has been found in the comparison of retrogression distance between empirical equations and field data. In the present study, flowslides and spreads are simulated using a Eulerian-based large-deformation finite-element (FE) method. In addition to strain-softening, a strain-rate-dependent undrained shear strength model that elevates the strain rate effects on the shear strength of liquefied clay flowing at high speed is used. In flowslides, a higher rate of increase in undrained shear strength with depth reduces the depth of subsequent slides, and thereby the retrogression distance. The maximum retrogression occurs for a uniform shear strength profile. The increase in the ratio of horizontal to vertical stress, resistance to downslope movement of the debris and decrease in soil brittleness and slope steepness change the failure pattern from a flowslide to a spread.
Summary(Plain Language Summary, not published)
Flowslides and spreads are the two main types of very large landslides that can occur in clays in Eastern Canada, part of British Columbia and Alaska, and in Scandinavia. These landslides can be triggered by natural causes such as bank erosion along watercourses, heavy or prolonged rainfall, and earthquakes, as well as inappropriate human activities such as slope toe excavation or overloading at the slope crest, uncontrolled water drainage, vibrations induced by blasting, etc. One of the most problematic issues for land-use planning and public safety is to determine the probable spatial extend of future landslides. This paper presents results of numerical models allowing the identification of the critical factors controlling the development of these landslides, and an estimation of their spatial extend.
GEOSCAN ID329240

 
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