Civil Engineering Reference
In-Depth Information
Figure 5.6
Grading curves for samples - Example 5.1.
Example 5.2: Calculations of the state of a soil sample
A sample of saturated soil is
38 mm in diameter and 78 mm long and its mass is 142 g. After oven drying at
105
◦
C its mass is 86 g.
−
−
W
W
d
W
d
142
86
Water content
w
=
=
=
0.651
=
65.1%
86
10
−
6
kN
Weight of saturated soil
W
=
142
×
9.81
×
=
4
×
38
2
10
−
9
m
3
Volume of cylinder
V
×
78
×
W
V
=
15.75 kN/m
3
Unit weight
γ =
From Eqs. (5.6) and (5.7)
1
1
w
+
1
γ
γ
1
v
w
=
−
1
1
15.75
9.81
1
v
1
0.651
+
=
−
v
=
2.72
From Eq. (5.6),
v
−
1
1.72
0.651
=
G
s
=
=
2.65
w
