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  2. School of Engineering
  3. Publikationen
  4. Publikationen School of Engineering
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dc.contributor.authorGiger, Silvio B.-
dc.contributor.authorEwy, Russell T.-
dc.contributor.authorFavero, Valentina-
dc.contributor.authorStankovic, Rudy-
dc.contributor.authorKeller, Lukas M.-
dc.date.accessioned2019-01-29T10:11:40Z-
dc.date.available2019-01-29T10:11:40Z-
dc.date.issued2018-
dc.identifier.issn2352-3808de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/14681-
dc.description.abstractSpecific equipment and procedures developed for geomechanical testing of hydrocarbon caprocks were adopted to conduct truly undrained triaxial tests with Opalinus Clay. The amount of pore pressure development during consolidation, and the resulting effective stress, is managed by equilibrating the samples in vacuum desiccators of different relative humidities (vapor equilibration technique) prior to assembling into the test apparatus. A drained consolidation test was first conducted to determine the appropriate strain rate for consolidated-undrained (CU) triaxial testing. Opalinus Clay samples were then consolidated in the triaxial rig to mean effective stresses in the range from 3 to 52 MPa and eventually sheared. Within the explored stress range elastic and pore pressure coupling parameters were found to be stress dependent. The different stress paths to peak indicate a transition from overconsolidated to rather normally consolidated state, yet failure was in all tests dilatant, i.e. associated with a drop in pore pressure and strain-softening (more so at low effective stress). Accurate pore pressure monitoring enabled the discrimination of different deformation stages during deviatoric loading. In terms of Mohr-Coulomb strength parameters, transition from peak to post-peak strength is manifested by a reduction in the effective cohesion whereas the effective friction angle remains nearly constant. The robustness of the CU testing methodology is demonstrated by (i) diagnostic analyses, (ii) inconsistency of CU tests with two CU tests deliberately loaded faster to explore the effect of strain rate, and (iii) consistency of CU tests with two consolidated-drained tests. Finally, test results of two caprock shales are also shown for comparison. The caprocks are of similar basic properties as the Opalinus Clay and stem from a large data base of tests conducted using the same methodology.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofGeomechanics for Energy and the Environmentde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subject.ddc551: Geologie und Hydrologiede_CH
dc.titleConsolidated-undrained triaxial testing of Opalinus Clay : results and method validationde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
dc.identifier.doi10.1016/j.gete.2018.01.003de_CH
zhaw.funding.euNode_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end28de_CH
zhaw.pages.start16de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume14de_CH
zhaw.publication.reviewNot specifiedde_CH
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Giger, S. B., Ewy, R. T., Favero, V., Stankovic, R., & Keller, L. M. (2018). Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation. Geomechanics for Energy and the Environment, 14, 16–28. https://doi.org/10.1016/j.gete.2018.01.003
Giger, S.B. et al. (2018) ‘Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation’, Geomechanics for Energy and the Environment, 14, pp. 16–28. Available at: https://doi.org/10.1016/j.gete.2018.01.003.
S. B. Giger, R. T. Ewy, V. Favero, R. Stankovic, and L. M. Keller, “Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation,” Geomechanics for Energy and the Environment, vol. 14, pp. 16–28, 2018, doi: 10.1016/j.gete.2018.01.003.
GIGER, Silvio B., Russell T. EWY, Valentina FAVERO, Rudy STANKOVIC und Lukas M. KELLER, 2018. Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation. Geomechanics for Energy and the Environment. 2018. Bd. 14, S. 16–28. DOI 10.1016/j.gete.2018.01.003
Giger, Silvio B., Russell T. Ewy, Valentina Favero, Rudy Stankovic, and Lukas M. Keller. 2018. “Consolidated-Undrained Triaxial Testing of Opalinus Clay : Results and Method Validation.” Geomechanics for Energy and the Environment 14: 16–28. https://doi.org/10.1016/j.gete.2018.01.003.
Giger, Silvio B., et al. “Consolidated-Undrained Triaxial Testing of Opalinus Clay : Results and Method Validation.” Geomechanics for Energy and the Environment, vol. 14, 2018, pp. 16–28, https://doi.org/10.1016/j.gete.2018.01.003.


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