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Engineering characteristics of sand-clay mixtures used for clay cores of earth-fill dams

Published online by Cambridge University Press:  09 July 2018

Z. Gökalp
Z. Gökalp*
Affiliation:
Erciyes University Seyrani Agricultural Faculty, Agricultural Structures and Irrigation Department, 38039, Kayseri, Turkey
*
*E-mail: zgokalp@erciyes.edu.tr
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Abstract

Clay is the main construction material for clay cores of earth-fill dams. Clay minerals swell when they become wet and shrink when they dry out; cracks develop as they lose moisture. If precautions are not taken to prevent seepage through these cracks, dam failures may result. In this study, sand was added to montmorillonite-dominant clay soils to investigate the effect of sand-inclusion rates on the engineering characteristics of clay soils used in the construction of clay cores of earth-fill dams. Changes in the consistency limits, compaction characteristics, permeability, stress-strain relationships and swelling characteristics with increasing sand inclusion rates were evaluated. Based on the results from experimental trials, a 30% sand inclusion rate appears to be the optimum proportion; most of the swelling occurred in the voids of grains and led to permeability levels below the allowable limits for earth-fill dams.

Keywords

sand-clay mixturesclay coreexpansive clayearth-fill damsmontmorillonite
Type
Research Article
Information
Clay Minerals , Volume 44 , Issue 3 , September 2009 , pp. 319 - 326
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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