Determining Intrinsic Compressibility of Fine-Grained Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 8
Abstract
Results of laboratory oedometer tests on reconstituted specimens of four clays prepared at different initial water contents, ranging from the liquid limit to 1.75 times the liquid limit, show that the intrinsic compression line may not be “unique” for a given soil. This suggests that the “intrinsic” parameter which is based on the constants of intrinsic compressibility, (void ratio corresponding to and may in fact not be a truly intrinsic parameter of the soil, but is dependent on sample preparation. The positioning of the normalized compression curve in space is significantly influenced by the initial remolding water content, therefore resulting in differing values of for a given soil depending on the initial water content. The influence of initial water content was greater for kaolinitic and illitic clay than for montmorillonitic clay. It is hypothesized that the difference in behavior may be attributed to differences in mineralogy. The results illustrate that caution should be used when comparing tests results from widespread sources and suggest that a standard level of initial water content be used to evaluate the intrinsic compressibility.
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Copyright © 2004 American Society of Civil Engineers.
History
Received: Jan 10, 2002
Accepted: Dec 17, 2003
Published online: Jul 15, 2004
Published in print: Aug 2004
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