Use of a downhole block sampler for very soft organic soils

DC FieldValueLanguage
dc.contributor.authorLong, Michael (Michael M.)-
dc.date.accessioned2011-08-04T16:25:12Z-
dc.date.available2011-08-04T16:25:12Z-
dc.date.copyright2006 ASTM internationalen
dc.date.issued2006-09-
dc.identifier.citationASTM Geotechnical Testing Journalen
dc.identifier.issn1945-7545-
dc.identifier.urihttp://hdl.handle.net/10197/3069-
dc.description.abstractTechniques required to successfully obtain downhole block samples of typical very soft high plasticity organic clay from Ireland are described. The vane shear strength of the material is as low as 4 kPa. These included using a sampler penetration rate three times faster than normally adopted. Comparisons are made between the results of laboratory tests on Sherbrooke block samples, on two fixed piston tube samplers and on a continuous sampler. In addition idealised tube sampling strains were imposed on block sample specimens prior to shearing (ISA approach). Both approaches confirmed that the material studied could not survive tube sampling undamaged, unlike the findings of a recent study in the Netherlands on Dutch organic soil. Tube sampling was found to have a more significant effect on triaxial test parameters that on those from the 1D compression testing, where the behaviour of the block sample specimens and those from one of the two tube samplers were similar to in situ response. Increasing levels of disturbance were associated with progressively more dilatant behaviour.en
dc.description.sponsorshipNot applicableen
dc.format.extent509563 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherASTM Internationalen
dc.relation.requiresArchitecture, Landscape & Civil Engineering Research Collectionen
dc.relation.requiresCritical Infrastructure Group Research Collectionen
dc.relation.requiresUrban Institute Ireland Research Collectionen
dc.rightsThis is a preprint of an article published in Geotechnical Testing Journal, : 426-438, available at http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/GEOTECH/PAGES/GTJ100201.htmen
dc.subjectSoft claysen
dc.subjectSiltsen
dc.subjectOrganic soilen
dc.subjectSamplingen
dc.subjectDisturbanceen
dc.subjectLaboratory testsen
dc.subjectIn situ behaviouren
dc.subject.lcshClay--Samplingen
dc.subject.lcshHistosols--Samplingen
dc.subject.lcshSilt--Samplingen
dc.titleUse of a downhole block sampler for very soft organic soilsen
dc.typeJournal Articleen
dc.internal.availabilityFull text availableen
dc.internal.webversionshttp://dx.doi.org/10.1520/GTJ100201-
dc.statusPeer revieweden
dc.identifier.volume29en
dc.identifier.issue5en
dc.identifier.startpage426en
dc.identifier.endpage438en
dc.identifier.doi10.1520/GTJ100201-
dc.neeo.contributorLong|Michael (Michael M.)|aut|-
item.grantfulltextopen-
item.fulltextWith Fulltext-
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection
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