Rock compressibility at the Wairakei-Tauhara geothermal field, New Zealand

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dc.contributor.author Pender, Michael en
dc.contributor.author Ramsay, G en
dc.contributor.author Glynn-Morris, T en
dc.contributor.author Lynne, Bridget en
dc.contributor.author Bromley, C en
dc.date.accessioned 2017-10-23T22:24:00Z en
dc.date.issued 2013-04 en
dc.identifier.citation Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 166(2):224-234 Apr 2013 en
dc.identifier.issn 1353-2618 en
dc.identifier.uri http://hdl.handle.net/2292/36192 en
dc.description.abstract Geothermal fluid has been extracted from the Wairakei field in New Zealand since the mid-1950s for electricity generation. This has induced regional subsidence of more than 1 m; in addition, there are a few localised bowls with much greater subsidence. A comprehensive geotechnical investigation with recovery of undisturbed samples from depths of up to 774 m was undertaken with testing of samples from within and outside subsidence bowls to determine material properties, with the aim of improved understanding of subsidence within the Wairakei–Tauhara geothermal system. Results from more than 130 K0 triaxial compression tests on core samples are discussed. Given the volcanic origins of most of the material present, a wide variation in the measured constrained modulus values is not surprising. Scanning electron microscope images reveal differences between the texture of the soft materials and the very stiff materials; these correlate with the constrained modulus values. The applicability of the Terzaghi effective stress equation is considered in relation to the measured property values; the conventional equation remains valid even for the least compressible materials tested. en
dc.language English en
dc.publisher ICE Publishing en
dc.relation.ispartofseries Proceedings of the Institution of Civil Engineers - Geotechnical Engineering en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Science & Technology en
dc.subject Technology en
dc.subject Physical Sciences en
dc.subject Engineering, Geological en
dc.subject Geosciences, Multidisciplinary en
dc.subject Engineering en
dc.subject Geology en
dc.subject ENGINEERING, GEOLOGICAL en
dc.subject GEOSCIENCES, MULTIDISCIPLINARY en
dc.subject energy en
dc.subject subsidence en
dc.subject EFFECTIVE STRESS en
dc.subject CONSOLIDATION en
dc.subject DEFORMATION en
dc.title Rock compressibility at the Wairakei-Tauhara geothermal field, New Zealand en
dc.type Journal Article en
dc.identifier.doi 10.1680/geng.12.00034 en
pubs.issue 2 en
pubs.begin-page 224 en
pubs.volume 166 en
dc.rights.holder Copyright: ICE Publishing en
pubs.end-page 234 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 380454 en
pubs.org-id Engineering en
pubs.org-id Civil and Environmental Eng en
pubs.org-id Engineering Science en
dc.identifier.eissn 1751-8563 en
pubs.record-created-at-source-date 2017-10-24 en


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