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Etude expérimentale de l'endommagement des roches par des méthodes acoustiques

Abstract : Our aim is here a better understanding of damage process of stressed rocks. We have therefore conducted a micro-macro study of the rock damage in the sense that we have realized microscopic and macroscopic measurements of its evolution during mechanical tests. This study has consisted of : - measurements of elastic modulus before the macroscopic rupture ; - measurements of the velocity of elastic waves and attenuation ; - measurements of acoustic activity (AE events). This study led to the following results : - Results from the three types of measurements are consistent. - Damage of rocks which have different macroscopic behaviours follows from micro-mechanisms which are also different. For dilative rocks, we observe tensile micro-mechanisms (Mode I). For not dilative rocks, damage results from shear microscopic process. - A correlation between micro-mechanisms type (compressive, tensile, shear) and the frequency of AE events is observed. Compressive microscopic process such as microcrack closure ar low frequency. Tensile AE sources are high frequency. Shear micromechanisms are characterized by intermédiate frequency
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Submitted on : Thursday, March 29, 2018 - 1:56:24 PM
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Jérôme Wassermann. Etude expérimentale de l'endommagement des roches par des méthodes acoustiques. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL035N⟩. ⟨tel-01752746⟩



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