Stability analysis of unsaturated deposits: Effect of soil properties and hydro-mechanical coupling

G. Buscarnera, C. Di Prisco

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper investigates the mechanical conditions governing the activation of shallow landslides in unsaturated deposits. Particular attention is given to the effect of saturation processes applied under a constant total state of stress. For the sake of generality, multiple failure mechanisms are considered and are interpreted in the light of a unified theoretical framework. The analyses rely on the scheme of infinite slope and on the use of a coupled hydro-mechanical constitutive model. Simple shear test simulations are used to investigate the role of stress anisotropy, initial suction and soil properties. The simulations show that the predicted mechanism of activation depends on the material constants that reproduce the coupling between retention properties and stress-strain behavior. These constants affect the magnitude of the triggering perturbations and can play a relevant role in collapsible/liquefiable deposits. In particular, it is shown that the range of slope inclinations prone to originate a runaway instability can be a function of such hydro-mechanical coupling terms, thus depending on material constants that are not directly associated with the shearing resistance.

Original languageEnglish (US)
Title of host publicationLandslides and Engineered Slopes
Subtitle of host publicationProtecting Society through Improved Understanding - Proceedings of the 11th International and 2nd North American Symposium on Landslides and Engineered Slopes, 2012
EditorsErik Eberhardt, Corey Froese, A. Keith Turner, Serge Leroueil
PublisherCRC Press/Balkema
Pages1745-1751
Number of pages7
ISBN (Print)9780415621236
StatePublished - 2012
Event11th International Symposium on Landslides and 2nd North American Symposium on Landslides, 2012 - Banff, Canada
Duration: Jun 2 2012Jun 8 2012

Publication series

NameLandslides and Engineered Slopes: Protecting Society through Improved Understanding - Proceedings of the 11th International and 2nd North American Symposium on Landslides and Engineered Slopes, 2012
Volume2

Conference

Conference11th International Symposium on Landslides and 2nd North American Symposium on Landslides, 2012
CountryCanada
CityBanff
Period6/2/126/8/12

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geotechnical Engineering and Engineering Geology

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