SYMPOSIA PAPER Published: 01 January 1971
STP26662S

Loss of Strength Due to Sampling in a Glacial Lake Deposit

Source

Large discrepancies between the undrained strength values measured by in situ vane and those measured by laboratory triaxial tests on tube samples, in a glacial lake deposit, are analyzed in terms of changes in effective stress during the sampling process. Data are presented to show that even in a relatively insensitive and reworked clay, significant loss in strength can occur due to the stress release effects of sampling at depth. The loss of strength is attributed to the loss of suction which occurs during sampling. Reconsolidating an undisturbed specimen to its estimated in situ vertical stress under Ko condition or to an equivalent isotropic stress, before running an undrained test, is shown to yield correct in situ strength, of a normally consolidated clay. A method of correcting for conventional undrained testing is proposed based on the computed loss of suction as related to change in moisture content due to swelling.

Author Information

Adams, JI
Hydro Electric Power Commission of Ontario, Toronto, Ont., Canada
Radhakrishna, HS
Hydro Electric Power Commission of Ontario, Toronto, Ont., Canada
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Developed by Committee: D18
Pages: 109–120
DOI: 10.1520/STP26662S
ISBN-EB: 978-0-8031-4594-8
ISBN-13: 978-0-8031-0050-3