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http://dx.doi.org/10.7843/kgs.2012.28.7.31

Evaluation of Cyclic Shear Strength Characteristics of Sands Containing Fines  

Kim, Uk-Gie (Geotechnical Engineering Research Division, KICT)
Kim, Dong-Wook (Geotechnical Engineering Research Division, KICT)
Lee, Joon-Yong (Geotechnical Engineering Research Division, KICT)
Kim, Ju-Hyong (Geotechnical Engineering Research Division, KICT)
Publication Information
Journal of the Korean Geotechnical Society / v.28, no.7, 2012 , pp. 31-40 More about this Journal
Abstract
In most design codes, soils are classified as either sandy or clayey soils, and appropriate design equations for each soil type are used to estimate their soil behaviour. However, sand-fine mixtures, which are typically referred to as intermediate soils, are somewhere at the middle of sandy or clayey soils, and therefore a unified interpretation of soil behaviour is necessary. In this paper, a series of cyclic shear tests were carried out for three different combinations of sand-fine mixtures with various fines content. Silica-sand mixture and fines (Iwakuni natural clay, Tottori silt, kaolinite) were mixed together with various mass ratios, while paying attention to the changes of void ratios expressed in terms of sand structure. The cyclic shear strengths of the mixtures below the threshold fines content were examined with the increasing fines contents. As a result, as the fines contents increased, their cyclic deviator stress ratios decreased for dense samples while it increased for loose samples. Additionally, cyclic deviator stress ratio of the mixtures was estimated using the concept of equivalent granular void ratio.
Keywords
Equivalent granular void ratio; Fines content; Liquefaction resistance; Sand skeleton structure; Sand-fines mixtures;
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