Index Test Method for Estimating the Effective Preconsolidation Stress in Clay Deposits
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 10
Abstract
The effective preconsolidation stress () of clay is classically determined from one-dimensional consolidation tests on undisturbed samples but a first-order approximate value can be estimated from its plasticity and water content characteristics. In this paper, initially a twofold simple empirical model for predicting that bifurcates at an overconsolidation ratio (OCR) of 3 is developed, and then its validity and generality are evaluated using an external (independent) validation data set that includes 500 records from 50 different sites. The proposed model is accompanied by a discriminant function that uses water content and plasticity characteristics to separate soils with (contractive) versus soils with (dilative). The results of applying the new and existing simple empirical models to the validation data set indicate that the predictive capability of the new model is quite superior to prior existing approaches that have unacceptable performance.
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Acknowledgments
The first author acknowledges financial support provided by Saghez Branch, Islamic Azad University (IAU). The writers wish to express their sincere appreciation to the editor, Professor Timothy D. Stark, and two anonymous reviewers for their constructive comments, which have helped in sharpening the paper.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 10 • October 2016
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© 2016 American Society of Civil Engineers.
History
Received: Aug 11, 2015
Accepted: Feb 11, 2016
Published online: May 31, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 31, 2016
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