CE 325: Geotechnical Engineering I
Kitch 20070405
1/4
CE 325
Problem Set #3
Complete the following problems
1.
A moist cube of soil weighs 1.5 kN and has a volume of 0.09 m
3
. Its moisture content
is 29.0% and the specific gravity of solids is 2.65. Compute the void ratio, porosity,
degree of saturation, unit weight of this soil and show a complete phase diagram.
2.
A saturated soil has a moisture content of 27.0% and a specific gravity of solids of
2.70.
Compute the void ratio, porosity and unit weight of this soil in lb/ft
3
.
3.
A sample of clay was obtained from a point below the groundwater table. A moisture
content test on this sample produced the following data:
Mass of can = 30.52g
Mass of can + moist soil = 172.03g
Mass of can + dry soil = 147.85g
a.
Compute the moisture content.
b.
Assume a reasonable value for
G
s
, and then compute the void ratio and
unit weight.
4.
An undisturbed cylindrical soil sample is has a volume of 0.25 ft
3
.
It has a measured
weight of 31.32 lb. A small portion was removed and a moisture content test was
performed on it.
The results of this test on the subsample were:
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 Spring '08
 staff
 Geotechnical Engineering, Cubic yard, Albert Atterberg

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