Question

On analysis of particle size distribution of a soil. it is found that $D_{10}=0.1mm,D_{30}=0.3mmand{D}_{60}=0.8mm$. The uniformity coefficient and coefficient of curvature, as given by the particle size distribution curve, are respectively

• A. 3 and 3
• B. 2.67 and 1.125
• C. 2.6 7and 3
• D. 8 and 1.125

Answer 1

The correct option is D 8 and 1.125

$C_u=\frac{D_{60}}{D_{10}}=\frac{0.8}{0.1}=8$

$C_c=\frac{(D_{30}{)}^2}{D_{60}\times D_{10}}=\frac{(D_{30}{)}^2}{0.8\times 0.1}=1.125$