Comparison of finite element and limiting equilibrium analyses for an embedded cantilever retaining wall / A. B. Fourie in Géotechnique, Vol. 39 N°2 (Juin 1989)  

Public ISBD [article]  inGéotechnique > Vol. 39 N°2 (Juin 1989) . - pp. 175 –188 Titre : Comparison of finite element and limiting equilibrium analyses for an embedded cantilever retaining wall Type de document : texte imprimé Auteurs : A. B. Fourie, Auteur ; D. M. Potts, Auteur Année de publication : 2007 Article en page(s) : pp. 175 –188 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Retaining walls Finite elements Soil-structure interaction Earth pressure Diaphragm Résumé : The design of embedded cantilever retaining walls is often based on approximate limit equilibrium calculations. In this Paper the results of a limit equilibrium approach are compared with the results of a finite element study. Predictions of both embedment depth and maximum bending moments are compared and the finite element study is used to show the influence of such parameters as initial soil stress conditions and construction procedure. For the finite element study an elasto-plastic constitutive law is used to model the soil behaviour. The soil is assumed to behave in a fully drained manner with zero pore fluid pressures everywhere. Effective stress parameters are used to define the soil strength. The results of the comparison indicate that both the limit equilibrium method used in the Paper and the finite element approach give similar predictions of the embedment depth required to ensure stability. The maximum bending moment was calculated using two different limit equilibrium approaches. Generally it was found that predictions based on these approaches were greater than the corresponding values from the finite element analyses. In particular, for embedded cantilever walls formed by excavation in low K 0 soils or by bachtIlling one of the limit equilibrium approaches provided an overestimate of almost 50% of the maximum bending moment value predicted by the finite element method at a factor of safety of 2. The results of the study indicate that some reduction in bending moment as calculated by the limit equilibrium method may therefore be warranted. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.2.175 [article] Comparison of finite element and limiting equilibrium analyses for an embedded cantilever retaining wall [texte imprimé] / A. B. Fourie, Auteur ; D. M. Potts, Auteur . - 2007 . - pp. 175 –188. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°2 (Juin 1989) . - pp. 175 –188 Mots-clés : Retaining walls Finite elements Soil-structure interaction Earth pressure Diaphragm Résumé : The design of embedded cantilever retaining walls is often based on approximate limit equilibrium calculations. In this Paper the results of a limit equilibrium approach are compared with the results of a finite element study. Predictions of both embedment depth and maximum bending moments are compared and the finite element study is used to show the influence of such parameters as initial soil stress conditions and construction procedure. For the finite element study an elasto-plastic constitutive law is used to model the soil behaviour. The soil is assumed to behave in a fully drained manner with zero pore fluid pressures everywhere. Effective stress parameters are used to define the soil strength. The results of the comparison indicate that both the limit equilibrium method used in the Paper and the finite element approach give similar predictions of the embedment depth required to ensure stability. The maximum bending moment was calculated using two different limit equilibrium approaches. Generally it was found that predictions based on these approaches were greater than the corresponding values from the finite element analyses. In particular, for embedded cantilever walls formed by excavation in low K 0 soils or by bachtIlling one of the limit equilibrium approaches provided an overestimate of almost 50% of the maximum bending moment value predicted by the finite element method at a factor of safety of 2. The results of the study indicate that some reduction in bending moment as calculated by the limit equilibrium method may therefore be warranted. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.2.175

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