Sensitive pyroclastic soils in the Bay of Plenty, New Zealand: microstructure to failure mechanisms

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dc.contributor.authorMoon, Vicki G.en_NZ
dc.contributor.authorMills, Pip R.en_NZ
dc.contributor.authorKluger, Max O.en_NZ
dc.contributor.authorLowe, David J.en_NZ
dc.contributor.authorChurchman, G.Jocken_NZ
dc.contributor.authorde Lange, Willem P.en_NZ
dc.contributor.authorHepp, Daniel A.en_NZ
dc.contributor.authorKreiter, Stefanen_NZ
dc.contributor.authorMörz, T.en_NZ
dc.contributor.editorAlexander, G.J.en_NZ
dc.contributor.editorChin, C.Y.en_NZ
dc.coverage.spatialNapier, New Zealanden_NZ
dc.date.accessioned2017-12-10T22:48:51Z
dc.date.available2017-12-05en_NZ
dc.date.available2017-12-10T22:48:51Z
dc.date.issued2017en_NZ
dc.description.abstractSensitive soils derived from weathered rhyolitic pyroclastic materials are associated with many landslides in the Bay of Plenty. Undrained, consolidated static triaxial tests show contractive p’-q’ plots, strain-softening stress-strain behaviour coupled with rising pore water pressures, shear band formation after peak strength, and considerable strain softening. Cyclic triaxial tests confirm brittle failure and extensive softening of the soil. Pore pressure gradients developed during shearing initiate collapse of clay microstructures into shear zones; further excess pore pressure generation in the shear zone leads to progressive failure. Halloysite, a low-activity clay mineral, is associated with sensitive layers within the pyroclastic sequences. Mushroom cap–shaped spheroidal halloysite results in weak short-range interactions between exposed clay surfaces on incomplete spheroids. This weak bonding allows disassociation of clay aggregates during slope failure, leading to strain softening and the development of flow post-failure.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationMoon, V. G., Mills, P. R., Kluger, M. O., Lowe, D. J., Churchman, G. J., de Lange, W. P., … Mörz, T. (2017). Sensitive pyroclastic soils in the Bay of Plenty, New Zealand: microstructure to failure mechanisms. In G. J. Alexander & C. Y. Chin (Eds.), Proceedings 20th New Zealand Geotechnical Society Symposium, Napier, New Zealand, November 23-26 2017 (pp. 1–8). New Zealand Geotechnical Society.en
dc.identifier.urihttps://hdl.handle.net/10289/11555
dc.language.isoen
dc.publisherNew Zealand Geotechnical Societyen_NZ
dc.relation.isPartOfProceedings 20th New Zealand Geotechnical Society Symposiumen_NZ
dc.relation.urihttp://www.nzgs.org/library/nzgs20_moon/
dc.rights© 2017 copyright with the authors.
dc.source20th New Zealand Geotechnical Society Symposium NZGS2017en_NZ
dc.subjectsensitive soilen_NZ
dc.subjecttephraen_NZ
dc.subjecthalloysiteen_NZ
dc.subjectmicrostructureen_NZ
dc.titleSensitive pyroclastic soils in the Bay of Plenty, New Zealand: microstructure to failure mechanismsen_NZ
dc.typeConference Contribution
dspace.entity.typePublication
pubs.begin-page1
pubs.end-page8
pubs.finish-date2017-11-26en_NZ
pubs.start-date2017-11-23en_NZ
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