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Determination of coefficient of consolidation from early stage of log t plot

Robinson, RG and Allam, MM (1996) Determination of coefficient of consolidation from early stage of log t plot. In: Geotechnical Testing Journal, 19 (3). pp. 316-320.

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The standard curve-fitting methods, Casagrande's log t method and Taylor's root t method, for the determination of the coefficient of consolidation use the later part of the consolidation curve and are influenced by secondary compression effects. Literature shows that secondary compression is concurrent with primary consolidation and that its effect is to decrease the value of the coefficient of consolidation. If the early part of the time-compression data is used, the values obtained will be less influenced by secondary compression effects. A method that uses the early part of the log t plot is proposed in this technical note. As the influence of secondary compression is reduced, the value obtained by this method is greater than that yielded by both the standard methods. The permeability values computed from C-v (obtained from the proposed method) rue more in agreement with the measured values than the standard methods showing that the effects of secondary compression are minimized. Time-compression data for a shorter duration is sufficient for the determination of C-v if the coefficient of secondary compression is not required.

Item Type: Journal Article
Publication: Geotechnical Testing Journal
Publisher: Amer Society of Testing Materials
Additional Information: Copyright of this aritcle belongs to Amer Society of Testing Materials.
Keywords: coefficient of consolidation;secondary compression;degree of consolidation;permeability.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 30 May 2009 17:48
Last Modified: 18 Jun 2014 09:04
URI: http://eprints.iisc.ac.in/id/eprint/19543

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