Geology Reference
In-Depth Information
In order to find the degree of saturation, a single cubic foot of soil
specimen may be isolated as follows:
Weight of water in 1 ft
3
of soil specimen
122.7
105.0
17.7
lb
g
wet
g
dry
Volume of water in 1 ft
3
of soil specimen
weight of water
unit weight of water
17.7
62.4
0.284
ft
3
Weight of solid in 1 ft
3
of soil specimen
105.0 lb
γ
dry
Volume of solid in 1 ft
3
of soil specimen
weight of solid
specific gravity of solid
105.0
0.605
ft
3
62.4
1
2.78
21
62.4
2
Volume of void in 1 ft
3
of soil specimen
0.395
ft
3
1
volume
of
solid
1
0.605
volume of water
volume of void
Degree
of
saturation
100
0.284
0.395
100
71.9
%
These data, both given and computed, are shown on the form on page 359.
At the end of the chapter, two blank copies of this form are included for
the reader's use.
[B] Triaxial Compression
The first deformation dial reading
H
is
0.005 in.
The axial strain for
this particular applied load can be computed using Eq. (21-1):
Δ
¢
H
H
0
(21-1)
e
0.005
5.82
0.0009
e
The corresponding cross-sectional area of the specimen can be com-
puted using Eq. (21-2):
A
0
A
(21-2)
1
e
4.91
4.91
in
2
A
0.0009
1
Multiplying the proving ring dial reading (
0.0012 in.
) by the proving
ring calibration (
6,000 lb/in.
) gives a corresponding applied axial load
of 7.2 lb. Finally, dividing the applied axial load (7.2 lb) by the corre-
sponding cross-sectional area (4.91 in.
2
) gives a unit axial load of
1.5 lb/in.
2
(or psi).
Search WWH ::
Custom Search