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Sur l'identification des paramètres des lois de comportement des roches argileuses. : Sources électroniques à base de nanotubes de carbone - Application aux tubes amplificateurs hyperfréquence.

Abstract : This work aims to develop methods for identification of constitutive parameters of argillaceous rocks. Under the proposed underground research laboratory of the ANDRA, it is necessary to develop such methods for the interpretation of many steps to be performed on site. We focused on two major aspects of the rheological behavior of this type of rock: poroelastic behavior on the one hand and the elasto-viscoplastic other. The first part focuses on the identification of paramètresporoélastiques. Chapter 2 refers to the direct problem and discusses a number of important points concerning the inverse problem of identification. The third chapter is dedicated to the formulation of techniques for calculating gradient for linear poroelastic case. The numerical finite element is discussed. The methods of direct differentiation and adjoint state are validated on a two-dimensional numerical example using the code of finite element Cast3M. Uidentificationdes poroelastic coefficients argillaceous rocks of the Meuse Haute-Marne from laboratory tests is discussed in detail in Chapter 4. The use of semi-explicit approximate solution of problems provides a direct method for quick identification. The second part of the dissertation on the identification of elasto-viscoplastic parameters. The features ducomportementviscoplastiques argillaceous rocks Meuse Haute-Marne are discussed in Chapter 5 on the basis of experimental results. Modeling this behavior is considered. It proposes a model isotropic nonlinear viscoplastic avececrouissage to duplicate tests. The parameters of this law of behavior are identified on a creep test unîdîmensionnelen drained conditions. The deformations arise when poroelastic and viscoplastic behavior of the rock. We show that it is possible to separate these two phenomena. All parameters are identified poro-elastic viscoplastic, a semi-explicit solution of the creep test is used. Chapter 6 presents a method for identifying parameters elasto-viscoplastic in the general case. As already introduced in this chapter, identification reduces to the minimization of a cost functional. The gradient of the functional is calculated by direct differentiation. The direct differentiation method is developed for law Cast3M elasto-visco-plastic Norton-Hoff. The identification of parameters of this law on two-dimensional configuration unidimensionelleset underground coated or not is then presented. The measurements are simulated by a first direct calculation and eventually disrupted. The uniqueness and stability of this problèmed'identification are discussed. The method is then applied in Chapter 7 to a real case: the tunnel Chamoise. Dimensional modeling and two dimensional plane strain are used to solve the problem directly. The modeling assumptions are justified. The parameters obtained can reproduce the data adequately. The study of this real case can also make a number of recommendations on the in situ measurement devices to identify the parameters of constitutive equations.
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https://pastel.archives-ouvertes.fr/pastel-00002114
Contributor : Ecole Polytechnique <>
Submitted on : Thursday, July 29, 2010 - 3:48:47 PM
Last modification on : Wednesday, October 14, 2020 - 3:52:10 AM
Long-term archiving on: : Thursday, November 4, 2010 - 10:13:28 AM

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  • HAL Id : pastel-00002114, version 1

Citation

Brice Lecampion. Sur l'identification des paramètres des lois de comportement des roches argileuses. : Sources électroniques à base de nanotubes de carbone - Application aux tubes amplificateurs hyperfréquence.. Géophysique [physics.geo-ph]. Ecole Polytechnique X, 2002. Français. ⟨pastel-00002114⟩

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