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http://dx.doi.org/10.7843/kgs.2015.31.3.27

Shear Behaviour of Sand-silt Mixture under Low and High Confining Pressures  

Kim, Uk-Gie (Geotechnical Engrg. Research Division, KICT)
Zhuang, Li (Geotechnical Engrg. Research Division, KICT)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.3, 2015 , pp. 27-38 More about this Journal
Abstract
Triaxial tests on sand-silt mixture specimens under low and high confining pressures were performed to understand their shear behaviors. The fines content in the mixture is lower than the threshold value. A series of tests under different conditions including fines contents (0%, 9.8%, 14.7%, 19.6%), density of specimen (controlled by different compaction energies of $E_c=22kJ/m^3$, $E_c=504kJ/m^3$), confining pressure (100 kPa, 1 MPa, 3 MPa, 5 MPa) were performed to investigate influences of these factors. Based on the test results, the threshold fines content, where the dominant structure of mixture changes from sand-matrix to fines-matrix, decreases with the increase of confining pressure. Under very high confining pressures, as a result of sand particle crushing, the behavior of the dense specimen is similar to that of the loose specimen which shows hardening, compression behavior, and shear strength increases with increase of fines content. In conclusion, silt is granular material like sand, and its influence on shear behavior of sand-silt mixture is very different from that of plastic fines on sand-fines mixture.
Keywords
Sand-silt mixture; Non-plastic fines content; High confining pressure triaxial test; Shear behavior;
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Times Cited By KSCI : 1  (Citation Analysis)
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