Chapter 8
8.1 Eq. (8.12):
B
D
L
B
cq f
u4.01
195.0
114.5
net(u)
2
kip/ft 16.3
lb/ft 321,16
2
8.2
Depth (m)
N60
1.5
3.0
4.5
6.0
7.5
9.0
10.5
9
12
11
7
13
11
13
Average N60 =10.86 11
70
70
8.4 a. B = 15 m; cu = 50 kN/m2; L = 20 m; = 17.6 kN/m3
8.5 Eq. (8.21):
f
f
u
D
A
QB
D
LB
c
4.0
1
195.0
114.5
FS
8.6 B = 10 m; L = 12 m; Q = 30,000 kN
Chapter 8
Eq. (6.16):
2.1
10
12
1B
L
m
z
(m)
2
1B
z
n
m1
Ic
(Table 6.5)
coIq
av
(kN/m2)
4.0
0.8
1.2
0.81
5.202
1210
100030
81.0
6.6
1.32
1.2
0.64
0.160
1210
100030
64.0
9.2
1.84
1.2
0.45
5.112
1210
100030
45.0
2
av kN/m 159.2]5.112)1604(5.202[
6
1
o
o
o
cc
ce
HC
S
av
log
1
ed).consolidat(normally So,
kN/m 105
kN/m 103.58)81.95.17)(6.2()81.918)(2()2.4)(16(
2
2
co
c
o
m 0.425
58.103
2.15958.103
log
0.881
)2.5)(38.0(
c
S
8.7 We will need to use Table 6.4.
Chapter 8
At the middle of the clay layer:
515.1
6.6
10 z
B
m
818.1
6.6
12 z
L
n
om q22.0
At the bottom of the clay layer:
09.1
2.9
10 z
B
m
30.1
2.9
12 z
L
n
ob q189.0
av
)4(
6
1
bmt
140
2
B
8.9 B = 30 ft; L = 70 ft
73
8.10 From Eq. (8.48):
1
1
)5.35(
Chapter 8
74
74