SYMPOSIA PAPER Published: 01 January 1971
STP26665S

Sampling Disturbance in Champlain Clays

Source

A comparison of the results of laboratory tests on block and tube samples shows that the “cemented” sensitive clays are disturbed severely by conventional thin-wall tube sampling. The undrained shear strength is reduced to 50 to 60 percent of its original value, and the recompression index at pressures smaller than the preconsolidation pressure is doubled. Even the effective stress parameters at low stress level are greatly affected by sampling. This effect is attributed to the presence at the contact between the clay particles of “cementation bonds” which have a high sensitivity to strain.

Author Information

La Rochelle, P
Laval University, Quebec, P. Q., Canada
Lefebvre, G
Laval University, Quebec, P. Q., Canada
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Details
Developed by Committee: D18
Pages: 143–163
DOI: 10.1520/STP26665S
ISBN-EB: 978-0-8031-4594-8
ISBN-13: 978-0-8031-0050-3