Open AccessEffect of Adding Sand on Clayey Soil Shear Strength
Author(s) -
Yasir M. Al-Badran,
Abbas Fadhil Ibrahim Al-Ameri
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/870/1/012079
Subject(s) - cohesion (chemistry) , clay soil , friction angle , geotechnical engineering , geology , shear strength (soil) , internal friction , direct shear test , clay minerals , soil water , shear (geology) , soil science , mineralogy , materials science , composite material , chemistry , petrology , organic chemistry
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 3 . 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 ( C ) decrease as the sand percentage increases, while the angle of internal friction ( ϕ ) increases as the sand percentage increases. The cohesion ( C ) 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 ( ϕ ) 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.