Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Civil Engineering

The research studied the behavior of clayey sand soils under cyclic loading. Four significant factors were found to have the major effects on the cyclic resistance of the clayey sand soils; fines content, plasticity index, effective confining pressure, and normalized water content (w/L.L.). The results were consistent with the data in literature. However, the existing plasticity based liquefaction screening criteria were found to capture many of the factors affecting the liquefaction susceptibility of clayey sand soils, but they did not fully capture the liquefaction susceptibility of the clayey sand mixtures tested in this research under the imposed testing condition. Of particular concern was the effect of the effective confining pressure under which the specimens were consolidated and tested which had not been considered in any of the criteria. Consequently a correction factor was developed to adjust these criteria with respect to effective confining pressure

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