10 points 4 Classify Soil 1 by using the USCS method Soil 1

(10 points) 4) Classify Soil 1 by using the USCS method. Soil 1 is a non-plastic, inorganic soil. us SIEVE OPENING IN INCHES U.S. STEVE NUMBERS HYDROMETER 6 4 3 2 13 14 12 33 34 6 10 1416 20 30 40 50 10 100 140 2400 TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT a aj za 2 - 2x - -- G 30 D.O GRAIN SIZE IN MILLIMETERS SAND coarsc medium GRAVEL Coarse SILT OR CLAY COBBIES fine

Solution

For soil1, % Passing 0.075mm sieve = 15.5%, so more than 50% retained, and therefore it is a coarse grained soil.

% passing 4.75mm sieve = 100%, so less than 50% retained on 4.75mm and therefore it is sand.

Now D10 = 0.0305mm, D30= 0.21mm, D60 = 0.4

So coefficient of uniformity, Cu = D60/D10 = 0.4/0.0305 = 13.114 >=6

of curvation, Cc = D30*D30/(D10*D60) = 3.278 slightly greater than 3, So the soil can be classified as Poory graded Sand, SP