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Étude du comportement différé des sols et ouvrages géotechniques

Abstract : The research presented in this memory concerne the geomechanics domain. The purpose of it is the study of differed behavior on the soft soils by confronting the results obtained by numerical modeling with the experiments and observations on site. In a first part, the actual research concerning the principal actions carried out on the interpretation of creep (secondary consolidation), with an aim of estimating the soil creeps. This presentation gives a historic insight of this phenomenon and the different methods suggested for the use of the results of creep for construction in geotechnics. In the second part, the researche will consider the tests with the pressuremettre , as well as the tests in Diflupress. L.D, pressuremetre test of long duration developed for the study in-situ of creep. The objective of this part is to point out the complexity of the concept of modulus of deformation, in particular according to the amplitude of the deformations. In a third part, one presents the models of behavior, employed in the numerical simulations. Then, models HSM (Hardware Soil Model) and SSM (Software Soil Model) in the Plaxis code are described before detailing the model SSCM (Software Soil Creep Model) which will be used in the continuation of this study. This model is validated on different types of works and different fine soils. In a fourth part, we present the simulation of the pressuremetre test, and we study the dependence of the pressuremetre modulus ` EM' and the pressure limits ` pl' according to: different intrinsic parameters of the soil (Young E or of shearing G, Poisson's ratio modulus?, angle of friction?, angle of dilatancy?, C cohesion, coefficient of ground at rest K0 ...), of the geometrical characteristics of the probe (diameter, height). In a fifth part, we present the validation of model SSCM on homogeneous tests of laboratory (triaxial and oedometer), and we analyze the behavior of two works in fill and a large foundation raft.
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Contributor : Mohammad Alhusein <>
Submitted on : Friday, April 30, 2004 - 11:36:54 AM
Last modification on : Friday, November 6, 2020 - 3:55:24 AM
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Mohammad Alhusein. Étude du comportement différé des sols et ouvrages géotechniques. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00005992⟩

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