Civil Engineering Reference
In-Depth Information
7.13
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
1.0
18.7
17.2
1.09
0.988
0.14
3
0.75
2.3
2.41*
5.5
0.06
0.43
2.0
38.3
27.0
1.42
0.976
0.18
3
0.75
2.3
1.92*
4.4
0.05
0.28
3.5
67.7
41.7
1.62
0.958
0.20
6
0.75
4.5
1.55
7.0
0.08
0.40
4.5
87.3
51.5
1.70
0.946
0.21
6
0.85
5.1
1.39
7.1
0.08
0.38
5.5
107
61.3
1.75
0.934
0.21
7
0.85
6.0
1.28
7.7
0.14*
0.67
6.5
127
71.1
1.79
0.922
0.21
6
0.95
5.7
1.19
6.8
0.13*
0.62
7.5
146
80.9
1.80
0.910
0.21
10
0.95
9.5
1.11
11
0.16*
0.76
8.5
166
90.7
1.83
0.898
0.21
21
0.95
20
1.05
21
0.23
1.10
9.5
185
100
1.85
0.886
0.21
35
0.95
33
1.00
33
0.5
2.4
10.5
205
110
1.86
0.874
0.21
35
1.00
35
0.95
33
0.5
2.4
11.5
225
120
1.88
0.862
0.21
31
1.00
31
0.91
28
0.38
1.81
12.5
244
130
1.88
0.850
0.21
46
1.00
46
0.88
40
0.5
2.4
13.5
264
140
1.89
0.838
0.21
31
1.00
31
0.85
26
0.30
1.43
14.5
283
149
1.90
0.826
0.20
36
1.00
36
0.82
30
0.5*
2.5
15.5
303
159
1.91
0.814
0.20
39
1.00
39
0.79
31
0.5*
2.5
Notes:
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). CRR from Fig. 6.6, asterisk
means 15 percent fines curve was used.
*Suggested maximum values of
C
N
range from 1.7 to 2.0 (Youd and Idriss 1997, 2001).
