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Étude expérimentale de la localisation de la déformation par corrélation d’images sur un analogue de roche soumis à différentes conditions de chargement triaxiaux

Abstract : This work presents an experimental characterization of the strain localization and the rupture on a granular rock analogue material under different conditions of axisymmetric loading. The evolution of the strain localization was characterized by the two-dimensional image correlation technique. Two series of triaxial compression and extension tests were carried out at different confining pressure Pc. Taking advantage of the DIC technique and detailed characterization of GRAM1’s constitutive properties by Mas and Chemenda (2014, 2015), we show that the initiation of deformation localization bands is preceded by the uniform elastic and then elasto-plastic deformation. The strain localization is initiated in the dilatant regime (positive dilatancy factor β) and strain-softening (negative hardening modulus h). During the band evolution, the deformation within it becomes compactive (β<0) and is accompanied by the material hardening (h>0), which causes the band to widen and new bands to form successively. The formation of new bands causes a slowing down the deformation within the prior bands, which makes the progressively densified band network to continuously evolve. In axisymmetric extension tests, the fractures are formed perpendicular to the minor principal stress σ3 in an extensive stress state at low Pc then compressive when Pc increases. Our results show a continuous transition from the extensive fracture to shear fracture with an increase of compressive stress. This is suitable of the results obtained for extension tests performed on natural rocks (Ramsey and Chester, 2004; Bobich, 2005)
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Thi Phuong Huyen Tran. Étude expérimentale de la localisation de la déformation par corrélation d’images sur un analogue de roche soumis à différentes conditions de chargement triaxiaux. Sciences de la Terre. Université Côte d'Azur, 2016. Français. ⟨NNT : 2016AZUR4083⟩. ⟨tel-01447565⟩

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