Laboratory and field determination of preconsolidation pressures at Gloucester

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TypeArticle
Journal titleCanadian Geotechnical Journal
ISSN0008-3674
Volume20
IssueJune 3
Pages477490; # of pages: 14
Subjectpreconsolidation; clay soils; strain; experimental methods; test procedures; laboratory and in situ tests; strain rate effects; disturbance
AbstractIn recent literature several special test methods have been proposed to measure the preconsolidation pressure of a compressible clay soil. Five methods, in addition to the conventional oedometer test, were applied to the marine clays from the Gloucester test site. The preconsolidation pressures measured using these laboratory tests were compared with that mobilized in-situ below the centre of a test embankment. The investigation showed that the preconsolidation pressure is directly related to the rate of strain and that special techniques such as constant rate of strain, controlled gradient, single-stage loading, and anisotropic triaxial consolidation tend to overestimate the in-situ preconsolidation pressure. The conventional oedometer test using a load increment ratio of 0.5 and a reloading schedule of 24 h applied to good-quality undisturbed samples produced preconsolidation pressures that compared best with the in-situ values.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1105
NRC number22415
300
NPARC number20375385
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Record identifier24be8f9f-6f6c-45f0-9ac3-30c16cd45303
Record created2012-07-23
Record modified2016-05-09
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