Sampler trials on overconsolidated sensitive clay

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Journal titleASTM Special Technical Publication
Pages132142; # of pages: 11
Subjectsensitive clay; overconsolidated soils; soil tests; samples; sampling; sample disturbance; marine clays; consolidation; shear strength; vane test; evaluation; tests
AbstractDuring the excavation of pump wells for a sewage treatment plant, it was possible to obtain large, undisturbed, block samples of extremely sensitive yet overconsolidated clay from depths ranging from the surface to 70 ft. With these block samples as a reference, sampling was conducted with four types of piston samples, and the test results were compared with those obtained from the block samples. The in situ strength of the clay also was measured with the field vane test. Samplers used in the trials were the Swedish Foil, the Norwegian 54 mm, the Swedish 50 mm, and the 5-in.- diameter Osterberg hydraulic sampler. The results showed that none of the samplers nor the field vane test were successful in obtaining results that could be compared consistently with results obtained from the block samples. The main conclusion of this study is that present methods of sampling of such soils by boring from the surface do not produce satisfactory undisturbed samples in this material.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number11753
NPARC number20374464
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Record identifier6889acfa-2fae-45a5-b29e-46a0a2dea176
Record created2012-07-23
Record modified2016-05-09
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