Improved determination of preconsolidation pressure of a sensitive clay

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TypeArticle
Journal titleASTM Special Technical Publication
ISSN0066-0558
Issue254
Pages254271; # of pages: 18
Subjectsensitive clay; preconsolidation; soil consolidation; loads
AbstractPoor agreement between calculated and measured consolidation settlement in the Leda (Laurentian) clay of eastern Canada suggested that either the classical consolidation theory might not apply to this soil or that present testing techniques were not yielding the correct consolidation characteristics of the soil. An underestimation of the preconsolidation load was found to result from tests using normal procedures. An investigation of various techniques to improve the determination of the preconsolidation pressure are outlined in this paper. Increment loading tests with various increment sizes and increment durations were investigated as well as continuous loading tests under various controlled rates of stress application and various controlled rates of strain. It was found that small increment tests best defined the pressure-void-ratio curve, but required much time. A method of determining the point of 100 per cent primary consolidation on the log time- deflection plot of small increment tests was developed. Constant rate of strain tests show promise as possible rapid testing techniques.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-115
NRC number5528
253
NPARC number20374055
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Record identifierc9422f13-5ab8-47aa-a8d5-3da3ffaa1baa
Record created2012-07-23
Record modified2016-05-09
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