Question

In a soil specimen, 70% of particles are passing through 4. 75 mm IS sieve and 40% of particles are passing through 75 μ IS sieve. Its uniformity coefficient is 8 and coefficient of curvature is 2. AS per IS classification, this soil is classified as

• A. SP
• B. GP
• C. SW
• D. GW

Answer 1

The correct option is D GW

(d)
As less than 50% are passing through 75 $\mu$ IS Sieve, it is coarse grained soil. As % Sand (30%) = % Gravel (30%) will be classified as Gravelly soil.
Also $C_o\left(8\right)>6and{C}_c\left(2\right)$ is between 1 and 3 so it is well graded (W). So symbol will be GW as per IS.