Effets de la désaturation et de la resaturation sur l'argilite dans les ouvrages souterrains.

Abstract : Objective of this thesis is characterized by experimental approaches and digital water effects, mechanical and hydromechanical due to desaturation and resaturation argillite of the East, the future laboratory host rock underground storage of radioactive waste Bure (France). We present experimental and numerical approaches to characterize the phenomenon of water transfer in the argillite. A simple method of identification is proposed, by determining the moisture diffusivity from linearized weight measurements on samples (thin tube and thin plate) subjected to moisture levels in cycles of desaturation-resaturation. The water transfer is non-linear. To interpret this phenomenon, we establish a nonlinear numerical model taking into account physical phenomena (hydraulic conduction, vapor diffusion, phase change, etc..). We then study the evolution of physical and mechanical behavior of shale according to the humidity imposed, following a series of desaturation-resaturation successive stages. The water deformation, the propagation velocity of ultrasonic waves, the elastic properties, the fracture characteristics and phenomena deferred state dependent fluid material. The influence of desaturation and resaturation on "a scale model of a tunnel is studied. To highlight the anisotropy of the rock, it uses thick tube whose axis is parallel or perpendicular to bedding. These tubes are subjected to water loads by ventilation air humidity variable in their central hole. We use a nonlinear poroelastic model for interpreting the phenomena observed anisotropic hydro. It shows that water loading can lead to disruption of specimen that respect the directions of anisotropy of the rock, which may be interpreted by the hydromechanical model as a violation of a failure criterion in total stress traction. Finally, numerical calculations for the phenomena caused by desaturation and resaturation scale underground structures are made by numerical models calibrated from experimental results. The analytical and numerical solutions by finite element method are performed to predict the influence of desaturation and the resaturation massive mudstone in underground tunnels.
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Quoc Thai Pham. Effets de la désaturation et de la resaturation sur l'argilite dans les ouvrages souterrains.. Sciences de l'ingénieur [physics]. Ecole Polytechnique X, 2006. Français. ⟨pastel-00001810⟩

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