Étude de l'endommagement à court et long terme d'une roche poreuse

Abstract : Among the different phenomena responsible for the short and long term deformation of porous rocks, we have studied in this work the damage of an oolithic limestone in the semi-brittle regime and under different hydrous conditions. For this purpose, we have developed an experimental device allowing the simultaneous and continuous measurement of strains and elastic wave velocities, as well as acoustic emissions, on the same sample under mechanical loading and under different hydrous conditions. Particularly, the experimental setup allows simultaneous and continuous measurement of the five elastic wave velocities in 3 different directions of propagation (axial, lateral and off-axis) and 3 different directions of polarization (P and 2 perpendicular S), this almost instantaneously. These velocity measurements allow to assess the acoustic tensor at any time and thus to continuously monitor the evolution of the damage of the rock. The short and long term damage behavior of the limestone is modelled thanks to a phenomenological model which is based on a macroscopic generalization of the microscopic mechanisms highlighted by the experimental study (sliding-opening of existing cracks, nucleation of new cracks, propagation and coalescence of cracks). The short-term model reproduces very well the instantaneous behavior (stress-strain curves and evolution of elastic moduli). The long-term model, whose formulation is uncoupled from the short-term model, allows reproducing qualitatively the experimental creep curves
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Javad Eslami. Étude de l'endommagement à court et long terme d'une roche poreuse. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL006N⟩. ⟨tel-01748819⟩

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