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The liquefaction potential of sand-silt mixtures is investigated in this study. There has been widespread debate over the effect of silt on the liquefaction resistance of saturated sand-silt mixtures. Some researchers have reported that by increasing the fine content the liquefaction resistance of the sand-silt mixtures increases. However, recent researches have shown that silty sands are more liquefiable than clean sands, which is in complete contradiction with the previous results. The first purpose of this study is to reveal the true effect of silt on resistance to liquefaction of sandy specimens by means of a series of load-control cyclic triaxial tests. These tests were conducted on sand-silt mixtures in various fine contents. In addition, the anisotropic behavior of the sand-silt mixtures was studied in this research by exploring the effect of the initial shear stress and stress reversal. The effect of stress reversal was studied by introducing a new parameter RC. The effect of this parameter was investigated in detail, and it was found that this parameter has a crucial role in the behavior of sand-silt mixtures.
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