Creep based viscoplastic numerical modelling of soil deformations in vacuum application and removal

P.I. Kumarage, C.T. Gnanendran

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Soil Mechanics and Foundations (Numerical Analysis II)

ABSTRACT: With recent research on test embankment case studies and laboratory experiments, it is evident that vacuum consolidation can be effectively used to reduce long-term settlements in soft soil by taking the soil to an overconsolidated state with vacuum application and subsequent removal. Settlement characteristics during vacuum consolidation and swelling characteristics after removal of vacuum have found to be different, which needs careful attention in modelling. In this paper, a fully coupled Biot type elasto-viscoplastic (EVP) model is proposed to predict both excess pore pressures and settlements more accurately upon application and removal of vacuum. In addition, the effect of the duration of vacuum application and removal secondary compression is also discussed. Keywords: Creep, Vacuum Consolidation, Over-consolidation

RÉSUMÉ: Avec des recherches récentes sur des études de cas de remblai et des expériences en laboratoire, il est évident que la consolidation sous vide peut être utilisée efficacement pour réduire les tassements à long terme dans un sol meuble en soumettant le sol à un état surconsolidé. Les caractéristiques de sédimentation lors de la consolidation sous vide et les caractéristiques de gonflement après l'élimination du vide se sont révélées différentes, ce qui nécessite une attention particulière dans la modélisation. Dans cet article, un modèle élasto-viscoplastique (EVP) de type Biot entièrement couplé est proposé pour prédire plus précisément les pressions interstitielles et les tassements en excès lors de l'application et de l'élimination du vide. En outre, l'effet de la durée de l'application du vide et de l'élimination de la compression secondaire est également discuté. Mots-clés: Fluage, Consolidation sous vide, Sur-consolidation

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Cite this article:
P.I. Kumarage; C.T. Gnanendran (2018) Creep based viscoplastic numerical modelling of soil deformations in vacuum application and removal in GEO2018. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2018Paper211,author = P.I. Kumarage; C.T. Gnanendran,title = Creep based viscoplastic numerical modelling of soil deformations in vacuum application and removal,year = 2018}