Consolidation Properties of Huka Falls Formation-Linkages to Subsidence at Ohaaki and Wairakei
- Location
- Taupo Volcanic Zone; Wairakei, New Zealand; Ohaaki, New Zealand; Broadlands, New Zealand
- Conference
- New Zealand Geothermal Workshop
- Year
- 2001
- Session
- Geology
- Language
- English
Full text
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Abstract
Sandstones, siltstones and mudstones of the Huka Falls Formation have the properties of over-consolidated materials, but with high void ratios (e >l). Drillhole samples from Ohaaki geothermal field and surface samples from Te Totara Stream at Wairakei have been geotechnically tested in the laboratory and examined petrologically to better define their consolidation behaviour. The materials consistently show a sharp bi-linear loading behavior about their pre-consolidation pressures (0.5 - 5 MPa). Sediments with authigenic clay minerals that reflect higher hydrothermal temperatures (>12OoC) show more plastic deformation than those with lower void ratios and lower temperature signatures.
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