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Pré-publication, Document de travail

Acoustic monitoring of damages in cemented granular materials under oedometric loading: experiments and simulations

Abstract : We study the transition from cohesive to granular-like states of synthetic rocks under external loading by ultrasound velocity measurements and acoustic emission detections. Our model rocks are made of glass beads bonded with a few percent of cements, either ductile or brittle. Here we focus on the oedometric configuration where the fracture process is spatially diffuse without shear band. We found that both ductile and brittle cemented granular samples exhibit a plastic behavior beyond a certain loading stress, accompanied by a significant decrease of compressional wave velocity. Interestingly, we observed the intermittent stress drops in brittle samples and recorded simultaneously acoustic emissions whereas ductile samples were mostly aseismic. Moreover, during each stress drop, a decrease of the P-wave velocity was also observed, indicating a global elastic weakening. In order to investigate the crack growth process on the local scale, we perform finite element simulations of the quasistatic mechanical deformation and the elastic wave propagation in 2D dense cemented disk packings. We found that there is the very heterogeneous distribution of bond damage beyond a certain deformation. Moreover, a small amount of damage at the microscopic scale induces a dramatic decrease of P-wave velocity on the macroscopic scale, which is consistent with the experimental observation.
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https://hal.univ-grenoble-alpes.fr/hal-02929400
Contributeur : Michel Campillo <>
Soumis le : jeudi 3 septembre 2020 - 13:58:48
Dernière modification le : mardi 22 septembre 2020 - 03:37:08

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  • HAL Id : hal-02929400, version 1

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Vincent Canel, Xiaoping Jia, Ioan Ionescu, Michel Campillo. Acoustic monitoring of damages in cemented granular materials under oedometric loading: experiments and simulations. 2020. ⟨hal-02929400⟩

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