Civil Engineering Reference
In-Depth Information
7.14
Cyclic stress ratio
N
value corrections
v
,
v
,
FS
Depth,
m
kPa
kPa
v
/
v
r
d
CSR
N
value
C
r
N
60
C
N
(
N
1
)
60
CRR
CRR/CSR
2.5†
46.3
46.3
1.00
0.97
0.13
2
0.75
1.5
1.47
2.2
0.08*
0.62
3.0
56.1
51.2
1.10
0.96
0.14
3
0.75
2.3
1.40
3.2
0.10*
0.71
4.0
75.7
61.0
1.24
0.95
0.15
14
0.75
11
1.28
14
0.16
1.07
5.2
99.2
72.7
1.36
0.94
0.17
9
0.85
7.7
1.17
9.0
0.10
0.59
6.0
115
80.6
1.43
0.93
0.17
11
0.85
9.4
1.11
10
0.19*
1.12
7.0
134
90.4
1.48
0.92
0.18
18
0.95
17
1.05
18
0.20
1.11
8.0
154
100
1.54
0.90
0.18
13
0.95
12
1.00
12
0.14
0.78
9.0
174
110
1.58
0.89
0.18
9
0.95
8.6
0.95
8.2
0.10
0.56
10.2
197
122
1.61
0.88
0.18
3
1.00
3.0
0.91
2.7
0.08*
0.44
11.0
213
130
1.64
0.87
0.19
11
1.00
11
0.88
9.7
0.18*
0.95
12.2
236
141
1.67
0.85
0.18
8
1.00
8.0
0.84
6.7
0.07
0.39
13.0
252
149
1.69
0.84
0.18
17
1.00
17
0.82
14
0.16
0.89
14.2
276
161
1.71
0.83
0.18
20
1.00
20
0.79
16
0.17
0.94
*Curve for 35 percent fines used in CRR from Fig. 6.6.
Notes:
†SPT at 2 m used at groundwater table.
Cyclic stress ratio:
a
max
0.20
g, r
d
from Eq. (6.7).
N
value corrections:
E
m
0.6,
C
b
1.0,
C
N
from Eq. (5.2).
