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Chapter 16
16.1 a. Eq. (16.2):
90.4%
)100(
08.18
35.16
RC
(max)
(field)
d
d
16.2 a. Eq. (16.11):
13.08% )14)](600ln(1650991[PI)ln165.099.1(
opt ..Ew
3
kN/m 18.36
62.398.21
3
kN/m 20.06
72.378.23
Chapter 16
158
16.3 a. Eq. (16.9):
16.09% )18)(600log38.0951(PL)log38.095.1(
opt .Ew
16.4 Compacted d = 18.4 kN/m3.
3
kN/m 20.98
100
14
1)4.18()1(4.18
w
.
16.5 For the compacted fill,
3
kN/m
6.16.01 wsws
dGG
3
000,8 ws
ws
G
Borrow
pit
Void
ratio
Dry unit
weight, d
Volume of soil to be
excavated = Ws/d (m3)
Cost ($)
A
0.82
Gsw/1.82
9,100
9,100 9 = 81,900
B
0.91
Gsw/1.91
9,550
9,550 7 = 66,850
C
0.95
Gsw/1.95
9,750
9,750 8 = 78,000
D
0.75
Gsw/1.75
8,750
8,750 11 = 96,250
Borrow Pit B is the cheapest.
16.6 Eq. (16.17):
3.86
2222
10
2
20
2
50 )65.0(
1
)7.0(
1
)2(
3
)7.1(
)(
1
)(
1
)(
3
7.1 DDD
SN
Chapter 16
159
16.7 Eq. (16.17):
3.15
222 )72.0(
1
)91.0(
1
)2.3(
3
)7.1(
N
S
—Excellent
c. For t2 = 12 months [Eq. (16.23)],
39.0
2
8
)12)(52.0( 2
2
2
H
tC
Tv
v
)( f
16.9 a.
mm. 192
m 192.0
72
5872
log
2
)5)(3.0(
log
1
)(
)( o
po
o
cc
pe
HC
S
Chapter 16
© 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
160
b.
2
2
2
cm 1005
min)/cm 1.0(
567.0
t
Tv
t = 354,375 min = 246.09 days = 8.2 months
c. For t2 = 12 months,
829.0
2
cm 500
)14403012min)(/cm 1.0(
2
2
2
2
H
tC
Tv
v
From Figure 16.19, U 83%
From Figure 16.17, for U = 83% and
,806.0
72
58
)(
o
p
the value of
.3.0
)(
)(
p
f
2
kN/m 17.4
)58)(3.0(
)( f
16.10 a. Eq. (16.28):
9
)25.0)(2(
5.4
2
w
e
r
d
n
9
)9)(4(
4
4.1
4.19
2
2
22
© 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
161
16.11 Cv = Cvr = 0.042 ft2/day = 15.33 ft2/year
Vertical drainage:
Chapter 16
162
16.12 Eq. (16.39):
015.0
)5.5(
)30)(015.0( 22 H
tC
Tcv
c
0248.0
)5.5(
)50)(015.0( 22
2 H
tC
Tv
v
