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dc.contributor.author
Wild, Katrin M.
dc.contributor.author
Amann, Florian
dc.date.accessioned
2017-06-11T14:35:29Z
dc.date.available
2017-06-11T14:35:29Z
dc.date.issued
2014
dc.identifier.issn
1664-3178
dc.identifier.uri
http://hdl.handle.net/20.500.11850/94326
dc.description.abstract
In 2013, the results from the laboratory test series conducted in 2012/2013 to establish the water retention characteristics and relationship between suction and mechanical properties of the clayey facies of Opalinus Clay were integrated and re-evaluated. Water retention characteristics for wetting and drying conditions were established. Results of p-wave velocity measurements showed that the p-wave velocity normal to bedding (vp,n) dropped sharply upon desaturation until suction approached the air-entry value. The sharp decrease was associated with desiccation cracks solely oriented parallel to bedding. For suction in excess of the air-entry value, vp,n was constant, indicating no further desiccation damage. The suction at the shrinkage limit and at the air-entry point are similar in magnitude. The p-wave velocity parallel to bedding (vp,p) remained constant in the entire range of suction investigated. An almost linear increase in stress at the onset of dilation, Young’s modulus, unconfined compressive strength, and Brazilian tensile strength with increasing suction was observed up to a suction of 56.6 MPa. For suction larger than 56.6 MPa, relatively constant strength and stiffness was observed. The increase is associated with the net contribution of suction to strength/stiffness, which decreases non-linearly with decreasing volumetric water content. A comparison between strength values (Brazilian tensile and uniaxial compressive strength) obtained from specimens loaded parallel and perpendicular to bedding suggests a state dependent strength anisotropy. Additionally, two different laboratory test series were initiated in 2013. A first series of 20 confined compressive strength tests on fully saturated P- and S-specimens aims to derive drained and undrained poroelastic and mechanical properties. A second experimental program deals with the investigation of viscoelastic effects and local pore pressure evolution. Conceptual HM-coupled three-dimensional models revealed that pore pressure evolution around an excavation in a transversal isotropic media is strongly dependent on the sensor location with respect to bedding. Elastic volumetric strain may cause a significant drop in pore pressure when the tunnel face passes. This drop is similar to the pore pressure drop associated with dilatancy accompanying failure. To investigate the combined effect of dilatancy and stress-path dependent elastic volumetric straining, improvements of commercially available constitutive laws will be necessary.
dc.language.iso
en
dc.publisher
Eidgenössisches Nuklearsicherheitsinspektorat ENSI
dc.title
Mont Terri – HM Experiment Hydro-Mechanical Coupling
dc.type
Report
ethz.book.title
Erfahrungs- und Forschungsbericht 2013. Entwicklungen im Bereich der Grundlagen der nuklearen Aufsicht
ethz.journal.title
ENSI Erfahrungs- und Forschungsbericht
ethz.journal.volume
ENSI-AN-8779
ethz.pages.start
259
ethz.pages.end
265
ethz.notes
.
ethz.publication.place
Brugg
ethz.publication.status
published
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03465 - Löw, Simon / Löw, Simon
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03465 - Löw, Simon / Löw, Simon
ethz.date.deposited
2017-06-11T14:35:43Z
ethz.source
ECIT
ethz.identifier.importid
imp593652a9f0fd117681
ethz.ecitpid
pub:148221
ethz.eth
yes
ethz.availability
Metadata only
ethz.rosetta.installDate
2017-07-18T12:02:36Z
ethz.rosetta.lastUpdated
2018-11-02T17:16:39Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
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