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Soil Mechanics and Foundation Engineering - Engineering

Q1:

The coefficient of curvature for a well graded soil, must be between

A 0.5 to 1.0

B 1.0 to 3.0

C 3.0 to 4.0

D 4.0 to 5.0

ANS:B - 1.0 to 3.0

For single grained soil cu & cc =1.
Well graded soil cu= 5 & 1<cc<3.
Uniform Soil cu<3.
cc is curvature coefficient.
cu is uniformity coefficient. The coefficient of curvature is the ratio (D30) 2/ (D10. D60) , where D60, D30, and D10 are the particle diameters corresponding to 60, 30 and 10% finer on the cumulative particle-size distribution curve, respectively.