Evaluation of cyclic shear strength of mixtures with sand and different types of fines |
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| Authors: | Uk-Gie Kim Li Zhuang Dongwook Kim |
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| Institution: | 1. Geotechnical Engineering Research Division, Korea Institute of Construction Technology, Goyang, Republic of Korea;2. Department of Civil and Environmental Engineering, Incheon National University, Incheon, Republic of Korea |
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| Abstract: | Soils are classified as sandy soils and clayey soils in most soil classification systems, and appropriate equations are used for practical design, depending on soil type, to represent each soil behavior. Sand-clay mixtures, however, need a special standard to evaluate their specific behaviors since they are categorized as intermediate soils or transitional soils and typically show intermediate properties. In this article, a series of cyclic triaxial tests were conducted on specific sand-fines mixtures with three fine types and various fine contents. The behaviors of various soil mixtures (silica sand with Iwakuni natural clay, Tottori silt, and Kaolin clay) were investigated by considering a concept of granular void ratio expressed in terms of sand structure. The cyclic shear strengths of the soil mixtures were also evaluated by increasing the fine content but no more than the threshold fine content. In the results, the cyclic deviator stress ratio decreased in dense soils whereas it increased in loose soils by increasing the fine content. In addition, a simple equation was proposed to predict the liquefaction resistance of sandy soils by evaluating the cyclic deviator stress ratio with a concept of equivalent granular void ratio. |
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| Keywords: | Equivalent granular void ratio fine content liquefaction resistance sand-fine mixture sand skeleton structure |
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