D10 0.11 c 60 )( D10 ) (0.48)(0.11) Since Cu > 4 and Cc is between 1 and 3, the soil is well graded. 2.2 Cu D60 1.1 6.11 ; C D 2 0.412 0.727 0.73
D10 0.18 c
( D60 )( D10 ) (1.1)(0.18) Although Cu > 6, Cc is not between 1 and 3. The soil is poorly graded. The D10, D30, and D60 for soils A, B, and C are obtained from the grain-size distribution curves.
60 3.5 D2 1.952 Soil A: Cu
D10 17.5 ; 0.2 Cc 30
(D60 )(D10 ) (3.5)(0.2) 5.43