dc.contributor.author | Lozovyi, Serhii | |
dc.contributor.author | Bauer, Andreas | |
dc.date.accessioned | 2019-01-30T14:20:08Z | |
dc.date.available | 2019-01-30T14:20:08Z | |
dc.date.created | 2018-11-06T13:11:33Z | |
dc.date.issued | 2018 | |
dc.identifier.issn | 0016-8025 | |
dc.identifier.uri | http://hdl.handle.net/11250/2583178 | |
dc.description.abstract | In this work, an experimental study was carried out with the aim of reconciling static and dynamic stiffness of Opalinus Clay. The static and dynamic stiffness of core plugs from a shaly and a sandy facies of Opalinus Clay were characterized at two different stress states. The measurements included undrained quasi-static loading-unloading cycles from which the static stiffness was derived, dynamic stiffness measurement at seismic frequencies (0.5 – 150 Hz), and ultrasonic velocity measurements (500 kHz) probing the dynamic stiffness at ultrasonic frequencies. The experiments were carried out in SINTEF's low-frequency cell. The obtained results demonstrate that the difference between static and dynamic stiffness is due to both dispersion and non-elastic effects: Both the sandy and the shaly facies of Opalinus Clay exhibit large dispersion, i.e. a large frequency dependence of dynamic stiffness and acoustic velocities. Especially the dynamic Young's moduli exhibit very high dispersion; between seismic and ultrasonic frequencies they may change by more than a factor 2. P-wave velocities perpendicular to bedding are by more than 200 m/s higher at ultrasonic frequencies than at seismic frequencies. The static undrained stiffness of both the sandy and the shaly facies is strongly influenced by non-elastic effects, resulting in significant softening during both loading and unloading with increasing stress amplitude. The zero-stress extrapolated static undrained stiffness, however, reflects the purely elastic response and agrees well with the dynamic stiffness at seismic frequency. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | European Association of Geoscientists and Engineers (EAGE) | nb_NO |
dc.title | Static and dynamic stiffness measurements with Opalinus Clay | nb_NO |
dc.title.alternative | Static and dynamic stiffness measurements with Opalinus Clay | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | acceptedVersion | nb_NO |
dc.source.journal | Geophysical Prospecting | nb_NO |
dc.identifier.doi | 10.1111/1365-2478.12720 | |
dc.identifier.cristin | 1627500 | |
dc.relation.project | Norges forskningsråd: 234074 | nb_NO |
dc.description.localcode | Locked until 16.11.2019 due to copyright restrictions. This is the peer reviewed version of an article, which has been published in final form at [https://doi.org/10.1111/1365-2478.12720]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. | nb_NO |
cristin.unitcode | 194,0,0,0 | |
cristin.unitname | Norges teknisk-naturvitenskapelige universitet | |
cristin.ispublished | false | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |