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Micromechanics of Sheared Granular Layers Activated by Fluid Pressurization

Abstract : Fluid pressurization of critically stressed sheared zones can trigger slip mechanisms at work in many geological processes. Using discrete element modeling, we simulate pore-pressure-step creep test experiments on a sheared granular layer under a sub-critical stress state to investigate the micromechanical processes at stake during fluid induced reactivation. The global response is consistent with available experiments. The progressive increase of pore pressure promotes slow steady creep at sub-critical stress states, and fast accelerated dynamic slip once the critical strength is overcome. Our multi-scale analyses show that these two emergent behaviors correlate to characteristic deformation modes: diffuse deformation during creep, and highly localized deformation during rupture. Creep corresponds to bulk deformation while rupture results from grain rotations initiating from overpressure induced unlocking of contacts located within the shear band which, consequently, acts as a roller bearing for the surrounding bulk.
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https://hal.archives-ouvertes.fr/hal-03318190
Contributor : Luc Scholtès Connect in order to contact the contributor
Submitted on : Monday, August 9, 2021 - 2:45:35 PM
Last modification on : Sunday, June 26, 2022 - 3:11:49 AM
Long-term archiving on: : Wednesday, November 10, 2021 - 6:22:52 PM

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Hien Nho Gia Nguyen, Luc Scholtès, Yves Guglielmi, Frédéric Victor Donzé, Zady Ouraga, et al.. Micromechanics of Sheared Granular Layers Activated by Fluid Pressurization. Geophysical Research Letters, American Geophysical Union, 2021, 48 (14), pp.e2021GL093222. ⟨10.1029/2021GL093222⟩. ⟨hal-03318190⟩

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