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H w
(cm)
100
4.06
90
4.94
0.48
80
5.26
0.56
1.43
70
6.85
0.96
1.67
1.75
60
6.14
0.16
2.23
4.38
5.42
50
6.61
1.43
1.35
2.47
5.18
4.22
40
5.90
0.00
1.12
9.16
0.88
3.11
0.56
30
1.59
3.90
1.12
4.78
0.16
3.75
0.80
0.32
20
1.51
0.32
0.56
0.96
0.00
0.00
1.35
2.47
0.24
10
1.43
0.48
0.24
0.40
0.00
0.00
0.00
0.00
0.00
0.00
0
H d
0 0 0 0 0 0 0 0 0 0 0
(cm)
(a) Plot the wetting and drying boundary curves. (b) On the same graph, plot the following sequence:
starting with a dry material at 100 cm suction, wet to 50 cm; drain again to 80 cm; wet again to
20 cm.
8.4
Use the same F -distribution as shown in the previous problem. (a) Plot the wetting and drying
boundary curves. (b) On the same graph, plot the following sequence: starting with a fully saturated
soil, drain to 70 cm; wet again to 30 cm; drain finally to 90 cm.
8.5
Consider the F -function used in Example 8.3 and shown in Table 8.1. (a) Calculate and plot the
wetting and drying boundary curves. (b) On the same graph, plot the following sequence: starting
with a dry soil, wet to 8 cm; then drain the soil to 20 cm; finally, wet again to 4 cm.
8.6
A two-dimensional flow is taking place with a pressure gradient,
γ 1
w
p w =
0.02 i
0.03 j ,ata
point in a soil whose hydraulic conductivity tensor is:
k xx
1
k xy
.
20
.
003
k
=
=
k yx
k yy
0
.
003
0
.
2
The pressure is expressed as height of equivalent water column; the hydraulic conductivity is in
cm h 1 ; the x -axis is horizontal; and the y -axis is vertical. (a) What is the angle between the
pressure gradient and the x -axis? (b) What is the angle between the hydraulic head gradient and
the x -axis? (c) What is the specific flux (i.e., the rate of flow per unit bulk area normal to the
direction of flow) vector? (d) What is the angle this flux vector makes with the x -axis?
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