Investigation of Cyclic Behavior of Silty Sand Soils Using Cyclic Simple Shear Test Under Constant Volume Conditions

Document Type : Research Article


1 Masters geotechnical engineering, Department of civil engineering in Imam Khomeini International university, Qazvin, Iran

2 Department of Civil Engineering in Imam Khomeini International university, Qazvin, Iran


The study of the cyclic behavior of sandy soils during seismic loading has been one of the most important geotechnical issues in previous decades and is still one of the most geotechnical challenging aspects among researchers. In the earthquake, the soil is under initial constant normal stress and the shear stresses change direction regularly; as a result, the directions of main effective stresses on the soil sample are changed. In the present study, cyclic simple shear responses for different mixtures of clean silica sand and non-plastic silt have been evaluated. The laboratory experiments were performed at a constant cyclic stress ratio of 0.15 (CSR = 0.15) and effective confining pressures of 50, 100 and 150 kPa. A series of constant volume cyclic simple shear tests on silty sand samples have shown that by increasing the non-plastic fines up to 30%, the shear strain decreases and then with an increment of silt content to 40% the shear strain increases, but the shear strain of the sand with 40% silt is less than the clean sand. The results also indicate that the liquefaction resistance of clean sand under the same conditions is higher than that of silty sand specimens. Also, with increasing the confining pressure, the soil liquefaction resistance increases in all silt percentages.


Main Subjects

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