Consolidation by Vertical Drains beneath Circular Embankments, Application of Ring Wall Theory in Practice

N.T. Ngo

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: PROBLEMATIC SOILS - I Soft, Collapsible, Residual Soils

ABSTRACT: Application of prefabricated vertical drains has been proven to be one of the most attractive and cost effective methods to improve the ground condition where soft soil deposits are present. This paper presents insights into the simulation of preloading beneath circular shaped embankments or loading areas (e.g. circular oil tanks or silos). The concept of continuous concentric rings of equivalent drain walls is used to simulate discrete system of vertical drains. Analytical solution for radial drainage towards cylindrical drain walls is discussed. The practical implications of the proposed method in solving multidrain boundary value problems are shown through the analysis of the performance of the circular embankment at the Skå-Edeby (Area III). The calculated values of settlement, lateral displacement, and excess pore-water pressure are presented and compared with the real field data.

RÉSUMÉ: La technique de drains verticaux est une des plus attractives et la moins chère pour améliorer les propriétés physiques des dépôts alluvionnaires compressibles. Cet article présente une introduction à la simulation du pré-chargement sous talus ou surcharges circulaires (réservoir, silos). Le concept de murs équivalents drainants, circulaires et concentriques est utilisé pour simuler un réseau de drains verticaux individuels. La solution analytique de drainage radial par murs circulaires drainants est discutée. Les implications pratiques de la méthode pour résoudre le problème de drainage à Skå-Edeby (Zone III). Les valeurs théoriques de tassements, déplacements latéraux et pressions interstitielles sont présentées et comparées aux résultats obtenus sur site.

Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.

Cite this article:
N.T. Ngo (2016) Consolidation by Vertical Drains beneath Circular Embankments, Application of Ring Wall Theory in Practice in GEO2016. Ottawa, Ontario: Canadian Geotechnical Society.

@article{3873_0515191032,author = N.T. Ngo ,title = Consolidation by Vertical Drains beneath Circular Embankments, Application of Ring Wall Theory in Practice,year = 2016}