Modelling the onset of instability in oedometric tests on unsaturated bonded soils

G. Buscarnera*, R. Nova

*Corresponding author for this work

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

2 Scopus citations

Abstract

Unsaturated bonded geomaterials are characterized by two types of bonding contributions, one of mechanical origin (cementation between grains) and one of hydraulic origin (surface tensions in water menisci). Unstable phenomena can be produced as a consequence of the vanishing of either one or both contributions. A constitutive model is formulated in order to deal with instabilities induced by mechanical destructuration and saturation processes. Mechanical bonding and partial saturation are linked within the same strainhardening constitutive framework using convenient hardening laws. A theoretical approach to study soil instability in the unsaturated regime is then used. Finally, oedometric tests are simulated, showing the possibility of having a mechanical instability upon saturation and investigating the influence of different degrees of initial mechanical bonding.

Original languageEnglish (US)
Title of host publicationComputational Geomechanics, COMGEO I - Proceedings of the 1st International Symposium on Computational Geomechanics
Pages226-238
Number of pages13
StatePublished - Dec 1 2009
Event1st International Symposium on Computational Geomechanics, COMGEO I - Juan-les-Pins, France
Duration: Apr 29 2009May 1 2009

Other

Other1st International Symposium on Computational Geomechanics, COMGEO I
CountryFrance
CityJuan-les-Pins
Period4/29/095/1/09

ASJC Scopus subject areas

  • Geophysics
  • Geotechnical Engineering and Engineering Geology
  • Computational Mathematics

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  • Cite this

    Buscarnera, G., & Nova, R. (2009). Modelling the onset of instability in oedometric tests on unsaturated bonded soils. In Computational Geomechanics, COMGEO I - Proceedings of the 1st International Symposium on Computational Geomechanics (pp. 226-238)