Effect of Plastic Fines on Undrained Behavior of Clayey Sands
In recent years, the occurrence of several liquefactions in sandy soils containing various values of clay content has shown that in addition to silty sands, clayey sands are also susceptible to liquefaction. Therefore, it is necessary to investigate the properties of these soil compositions and their behavioral characteristics. This paper presents the effect of clay fines on the undrained shear strength of sands at various confining pressures. For this purpose, a series of unconsolidated undrained triaxial shear tests were carried out on clean sand and sand mixed with 5, 10, 15, 20, and 30 percent of clay fines. It was found that the presence of clay particle in sandy specimens change the dilative behavior to contraction. The result also showed that increasing the clay fines up to 10 percent causes to increase the potential for liquefaction, and decreases it at higher values fine content. These results reveal the important role of clay particles in changing the undrained strength of the sandy soil.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1340402Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 386
 Ghahramani, M., A. Ghalandarzadeh, and M. Moradi. "Effect of plastic fines on cyclic resistance of saturated sands." (2006): 71-80.
 Georgiannou, V. N., J. B. Burland, and D. W. Hight. "The undrained behaviour of clayey sands in triaxial compression and extension." Geotechnique 40.3 (1990): 431-449.
 Ovando-Shelley, E., and B. E. Perez. "Undrained behaviour of clayey sands in load controlled triaxial tests." Geotechnique47, No. 1 (1997): 97-111.
 Bouferra, R., and Isam Shahrour. "Influence of fines on the resistance to liquefaction of a clayey sand." Proceedings of the Institution of Civil Engineers-Ground Improvement 8, No. 1 (2004): 1-5.
 Abedi, Mehdi, and S. Shahaboddin Yasrobi. "Effects of plastic fines on the instability of sand." Soil Dynamics and Earthquake Engineering 30, No. 3 (2010): 61-67.
 Papadopoulou, Anthi I., and Theodora M. Tika. "The effect of fines plasticity on monotonic undrained shear strength and liquefaction resistance of sands." Soil Dynamics and Earthquake Engineering 88 (2016): 191-206.
 Ishihara, Kenji. "Liquefaction and flow failure during earthquakes." Geotechnique 43, No. 3 (1993): 351-451.
 Mitchell, J. K. 1993, “Fundamentals of Soil Behavior”, John Wiley and Sons, Inc., New York.
 Gratchev, Ivan B., Kyoji Sassa, Victor I. Osipov, and Viatcheslav N. Sokolov. "The liquefaction of clayey soils under cyclic loading." Engineering geology 86, No. 1 (2006): 70-84.
 Naeini, S. A., and M. H. Baziar. "Effect of fines content on steady-state strength of mixed and layered samples of a sand." Soil Dynamics and Earthquake Engineering 24, No. 3 (2004): 181-187.