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Contribution à l'étude des problèmes de déchargement dans les massifs de sol : application à la modélisation des ouvrages de soutènement

Abstract : This work analyses the potentials of different types of constitutive laws on loading and unloading paths with applications to the numerical simulation of excavations in soil masses. Two finite element procedures were used to simulate the excavation process, one proposed by Ghaboussi and Pecknold (1984) and Brown and Booker (1985) and the other by Borja et al. (1989). These methods were implemented in the finite element code CESAR-LCPC, and were compared to each other, in the case of multi-stage excavation in elastic and elastoplastic soils. A multiaxial loading-unloading criterion was also developed on the basis of the sign of work rate. This criterion, which includes the one directional case, allows to identify the extension of the loading and/or unloading areas around an excavation, for a given constitutive model. A nonlinear elastic model (Wong and Duncan), an elastic-perfectly plastic model with Mohr-Coulomb criterion and a work hardening model (Nova) were analysed with more detail. These models were first calibrated on triaxial test results, and then applied to the excavation problem. This approch was finally used to analyse a case study of excavation supported by a single braced sheetpile wall in sandy soil (university of Karlsruhe). The field measurements were compared with the finite element results obtained, using the both elastic-perfectly plastic model with Mohr-Coulomb criterion and Nova's work hardening model.
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Nasser Arafati. Contribution à l'étude des problèmes de déchargement dans les massifs de sol : application à la modélisation des ouvrages de soutènement. Sciences de la Terre. Ecole Nationale des Ponts et Chaussées, 1996. Français. ⟨tel-00523304⟩

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