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EVALUATION OF CONSOLIDATION SETTLEMENT IN SOFT SOILS UNDER HIGHWAY EMBANKMENT: A COMPARATIVE STUDY BETWEEN ONE-DIMENSIONAL SETTLEMENT THEORY AND FINITE ELEMENT MODELING USING MODIFIED CAM-CLAY MODEL

Abdul Karim Elsalfiti, Simon Grenier, Hamid Ghorbanbeigi

In the proceedings of: GeoVirtual 2020: 73rd Canadian Geotechnical Conference

ABSTRACT: Assessment of consolidation settlement under a highway embankment requires consideration in terms of variability in fill heights as well as clayey soil thickness and proprieties. Settlement calculation based on one-dimensional consolidation theory often relies on the evaluation of the critical section and assumes the applied load to be infinite in the x and z directions. Advanced solutions based on the modified Cam-Clay theory that evoke 2D and 3D finite element modeling and account for the stress distribution and volume changes during yielding as well as the geometric configurations of the studied area could result in optimized conceptions when light weight fill is required. This paper examines as a case study the consolidation settlement under an existing embankment on highway 50, in Quebec, Canada using 2D and 3D FEM modified Cam-Clay theory, to first validate the models against historical data. Then, the models are applied to design the new embankment of the adjacent north bound lanes where light weight fill will be required. The results obtained from these models are compared with those provided by the 1D consolidation theory.


RÉSUMÉ: L’évaluation des tassements de consolidation sous une autoroute mérite une attention particulière par rapport aux épaisseurs des sols de remblai en place et les couches d’argile variables. Les théories de tassement (1D) se fient généralement sur la coupe jugée critique et des calculs basés sur le principe d’une charge externe dont la configuration est infinie sur les plans x et z. Des méthodes plus récentes basées sur la théorie de Cam-Clay modifiée pour l’argile, qui impliquent une modélisation des éléments finis en 2D et 3D et qui tiennent compte des changements subis aux pressions hydrostatiques durant la période de consolidation peuvent s’avérer plus efficaces. Cet article examine le tassement de consolidation sur une section d’une nouvelle chaussée de l’autoroute 50. Une modélisation d’éléments finis basée sur la théorie Cam-Clay est développée pour évaluer les tassements de consolidation. Les résultats sont comparés avec la théorie de tassement 1D et une discussion comparative est présentée.


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Elsalfiti, Abdul Karim, Grenier, Simon, Ghorbanbeigi, Hamid (2020) EVALUATION OF CONSOLIDATION SETTLEMENT IN SOFT SOILS UNDER HIGHWAY EMBANKMENT: A COMPARATIVE STUDY BETWEEN ONE-DIMENSIONAL SETTLEMENT THEORY AND FINITE ELEMENT MODELING USING MODIFIED CAM-CLAY MODEL in GEO2020. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Elsalfiti_GEO2020_308, author = {Elsalfiti, Abdul Karim}, {Grenier, Simon}, {Ghorbanbeigi, Hamid},
title = EVALUATION OF CONSOLIDATION SETTLEMENT IN SOFT SOILS UNDER HIGHWAY EMBANKMENT: A COMPARATIVE STUDY BETWEEN ONE-DIMENSIONAL SETTLEMENT THEORY AND FINITE ELEMENT MODELING USING MODIFIED CAM-CLAY MODEL ,
year = 2020
}