Articles | Volume 13, issue 5
https://doi.org/10.5194/se-13-901-2022
https://doi.org/10.5194/se-13-901-2022
Research article
 | 
16 May 2022
Research article |  | 16 May 2022

Failure mode transition in Opalinus Clay: a hydro-mechanical and microstructural perspective

Lisa Winhausen, Kavan Khaledi, Mohammadreza Jalali, Janos L. Urai, and Florian Amann

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Latest update: 21 May 2024
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Short summary
Triaxial compression tests at different effective stresses allow for analysing the deformation behaviour of Opalinus Clay, the potential host rock for nuclear waste in Switzerland. We conducted microstructural investigations of the deformed samples to relate the bulk hydro-mechanical behaviour to the processes on the microscale. Results show a transition from brittle- to more ductile-dominated deformation. We propose a non-linear failure envelop associated with the failure mode transition.