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http://dx.doi.org/10.7843/kgs.2008.24.11.79

Characteristics of Undrained Cyclic Shear Behavior of Nak-Dong River Sand by Silt Contents  

Kim, Young-Su (Dept. of Civil Engrg., Kyungpook National Univ.)
Kim, Dae-Man (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.11, 2008 , pp. 79-89 More about this Journal
Abstract
In this study, a series of undrained cyclic triaxial tests were performed with three different consolidation stress ratios ($K_c$=1.0, 1.5, 2.0) to investigate the undrained shear strength characteristics of sands with respect to the amount of contained silt located around the basin of Nak-dong River. The test results show that the more the sand has silt, the lower is cyclic shear stress ratio (CSR) in all $K_c$ and that the higher $K_c$ goes, the larger CSR decreases due to the increase of contained silt. The excessive pore pressure caused during shearing has an influence on the decrease of CSR by the high initial pore pressure in proportion to the amount of contained silt regardless of the $K_c$ value. After consolidation, the analysis of the skeleton void ratio of the sample reveals that the main cause of the decrease of CSR as well as the increase of the initial excessive pore pressure is the increase of the skeleton void ratio in proportion to the amount of contained silt.
Keywords
Consolidation stress ratio; Cyclic stress ratio (CSR); Cyclic triaxial test; Silt content; Skeleton void ratio;
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