Articles | Volume 12, issue 9
Solid Earth, 12, 2109–2126, 2021
https://doi.org/10.5194/se-12-2109-2021
Solid Earth, 12, 2109–2126, 2021
https://doi.org/10.5194/se-12-2109-2021
Research article
23 Sep 2021
Research article | 23 Sep 2021

Micromechanisms leading to shear failure of Opalinus Clay in a triaxial test: a high-resolution BIB–SEM study

Lisa Winhausen et al.

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Latest update: 23 May 2022
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Short summary
An experimentally deformed sample of Opalinus Clay (OPA), which is being considered as host rock for nuclear waste in Switzerland, was studied by electron microscopy to image deformation microstructures. Deformation localised by forming micrometre-thick fractures. Deformation zones show dilatant micro-cracking, granular flow and bending grains, and pore collapse. Our model, with three different stages of damage accumulation, illustrates microstructural deformation in a compressed OPA sample.