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TitleModeling of initial stresses and seepage for large deformation finite-element simulation of sensitive clay landslides
AuthorWang, C; Hawlader, BORCID logo; Perret, D; Soga, K
SourceJournal of Geotechnical and Geoenvironmental Engineering vol. 147, issue 11, 2021.,
Alt SeriesNatural Resources Canada, Contribution Series 20210407
PublisherAmerican Society of Civil Engineers
Mediapaper; digital; on-line
File formatpdf
SubjectsScience and Technology; Nature and Environment; geophysics; landslides
ProgramPublic Safety Geoscience Intraplate Earthquakes
Released2021 08 17
AbstractGroundwater seepage and increased lateral earth pressure coefficient at-rest (K0) increase the potential for triggering large-scale landslides in sensitive clays. Once the failure is triggered, the successive retrogressive failure of soil blocks in the undrained condition is highly influenced by K0. This paper presents the numerical techniques for modeling seepage and K0 in a Eulerian-based large deformation finite element method. The finite element simulation is performed first for a drained condition to calculate the in-situ effective stresses and seepage forces, which are then used for modeling subsequent undrained retrogressive failure in total stress, triggered by toe erosion. A strain-softening and strain-rate dependent undrained soil strength model, which captures the behavior of soil to fluid-like remolded materials, is adopted in the retrogressive failure analysis. The FE simulation covers different phases of landslide, including the initiation and retrogression of failure, and debris runout. Finally, using the developed numerical technique, the 2010 Saint Jude landslide in Quebec, Canada, is simulated.
Summary(Plain Language Summary, not published)
Large retrogressive landslides in sensitive clays pose a significant threat to the population in Eastern Canada, parts of British Columbia and Alaska, and Scandinavia. These landslides can be triggered by natural causes such as bank erosion along watercourses, heavy or prolonged rainfall, and earthquakes, as well as by inappropriate human activities such as slope toe excavation or overloading at the slope crest, uncontrolled water drainage, vibrations induced by blasting, etc. Among the many factors controlling the initiation and development of these landslides, the flow of groundwater and the mechanical stresses in slopes play a major role. This paper presents results of a numerical model in which these factors are accounted for. This numerical model is then applied to the St. Jude landslide in the Montreal region which took the live of four people in 2010.

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