Effect of Adding Sand on Clayey Soil Shear Strength
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Abstract<p>The effect of adding sand on clayey soil shear strength is investigated in this study. Five different percentage of clay-sand mixtures are used; 100% clay with 0% sand termed 100C, 60% clay with 40% sand termed 60C-40S, 30% clay with 70% sand termed 30C-70S, 15% clay with 85% sand termed 15C-85S, and as well as 100% sand termed 100S. The used clay was obtained from Baghdad city in Iraq and classified as CH soil, while the used sand was taken from Al-Khider area from Iraq and classified as SW soil. The initial dry unit weight for all mixtures is 16 kN/m<sup>3</sup>. The results show that the variations of the soil shear strength properties with soil components content changes almost as polynomial function. The results show that the soil cohesion (<italic>C</italic>) decrease as the sand percentage increases, while the angle of internal friction (<italic>ϕ</italic>) increases as the sand percentage increases. The cohesion (<italic>C</italic>) decreases with 68%, 99%, 97% and 100% as the sand percentage increases with 40%, 70%, 85% and 100% respectively from pure clay soil 100C. While, the angle of internal friction (<italic>ϕ</italic>) increases with 148%, 410%, 471% and 676% as the sand percentage increases with 40%, 70%, 85% and 100% respectively from pure clay soil 100C. Finally, a predicted (fitting) equations are achieved for the variation of the clayey soil shear strength properties with sand content with good agreement.</p>
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