Prise en compte de l'effet de la mise en place dans la modélisation numérique en 3D des colonnes ballastées dans l'argile molle

• Autorzy: Nguyen N. T. , Foray P. , Flavigny E.
• Konferencja: Proceedings of the 14th French-Polish Colloguium "Soli and Rock Mechanics. soil Mechanics - Geomaterials" Grenoble, August 29-31, 2007
• Języki publikacji: FR

Abstrakty

EN

This paper presents a comparison of numerical modelling of the behaviour of reinforcements in the form of stone columns in very soft clay. The simulation is run using the software finite elements Plaxis, first in 2D, then in 3D. We are particularly interested in taking into account the application of the columns in modelling. Indeed, in practice, due to the expansion of the column, the ground in its close vicinity undergoes a lateral compaction and the horizontal stresses are increased. This lateral expansion of the stone column can be simulated numerically, with the values of volume deformation which correspond to those observed in practice, and which can be connected with those usually adopted for the ratio between the modulus of the column and the reinforced ground. It is shown that this expansion induces a significant decrease in the stone columns.

Słowa kluczowe

EN

numerical modelling; simulation; stone column

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2008
• Tom: Vol. 30, nr 1-2
• Strony: 189--198
• Opis fizyczny: bibliogr. 12 poz.,

Twórcy

autor

Nguyen N. T.

autor

Foray P.

autor

Flavigny E.

• Institut National Polytechnique de Grenoble, Laboratoire Sols Solides Structure Risques, Domaine Universitaire, BP 53, 38041 Grenoble

Bibliografia

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• [2] BRINKGREVE et al., Plaxis 3D Foundation, Manuels Plaxis 3DF Version 1.5. 2005, http://www.plaxis.nl/
• [3] DHOUIB A., BLONDEAU F., Colonnes ballastées, Presses de ENPC, Paris, 2005, 264 p.
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• [5] DEBATS J.-M. et al., Etat de la recherche entreprise dans la modélisation sous Plaxis de la mise enœuvre de colonnes ballastées dans une argile molle, Journée de Plaxis, Paris, 2006.
• [6] DTU 13.2 (Norme NF P. 11-212), Fondations profondes: colonnes ballastées, Chap. VIII. Paris, 1978, 57–59.
• [7] KIRSCH, Experimentell und numerische Untersuchungen zum Tragverhalten von Rüttelstopfsäulen-gruppen, Thèse, citée par Gäb (2005) «Numerical modelling of stone columns», séminaire W(h)ydoc05, Paris, 2004.
• [8] FLAVIGNY E., NGUYEN N.T., SANCHEZ P., Modélisation de colonnes ballastées, Journée de Plaxis, 2006, 16 Mai, Paris.
• [9] HANDY R.L., Does lateral stress really influence settlement, ASCE Journal of geotechnical and geoenvironmental engineering, 2001, Vol. 127, Issue 7, 623-626.
• [10] PRIEBE H.J., The design of vibro-replacement, Ground Engineering, Keller Grundbau, 1995, Technical paper, 12–61.
• [11] MATTES N.S., POULOS H.G., Settlement of single compressible pile, Journal of the soil mechanics and foundation division, 1969, No. 95(1), 189–207.
• [12] NGUYEN N.T., FORAY P., FLAVINGY E., Prise en compte de l’effet de la mise en place dans la modélisation numérique en 3D des colonnes ballastées dans l’argile molle. Calcul 2D ou 3D? Présentation du CFMS, Paris, le 14 Mars, 2006.