Table G-2
Calculation of CSR and (N1)60 critical.
Water Table at 20 ft
Design Earthquake:
γ= 115 pcf
PGA = 0.25 g
t
Mw =
6.75
σo
σo'
Kσ
rd
Km
(N1)60 cr M = 7.5
(N1)60 cr M = 6.75
Depth
CSR
ft
psf
psf
blows/ft
blows/ft
I
II
III
IV
V
VI
VII
VIII
IX
5
575
575
0.99
0.16
1.13
N/A
N/A
N/A
10
1150
1150
0.98
0.16
1.13
N/A
N/A
N/A
15
1725
1725
0.97
0.16
1.13
N/A
N/A
N/A
20
2300
2300
0.95
0.15
1.13
0.99
14.2
12.7
22.5
2588
2432
0.95
0.16
1.13
0.99
15.0
13.5
25
2875
2563
0.94
0.17
1.13
0.98
15.8
14.3
27.5
3163
2695
0.93
0.18
1.13
0.97
16.4
15.0
30
3450
2826
0.92
0.18
1.13
0.96
17.0
15.7
32.5
3738
2958
0.91
0.19
1.13
0.94
17.2
16.2
35
4025
3089
0.90
0.19
1.13
0.93
17.3
16.4
37.5
4313
3221
0.87
0.19
1.13
0.92
17.4
16.7
40
4600
3352
0.85
0.19
1.13
0.92
17.4
16.8
42.5
4888
3484
0.82
0.19
1.13
0.91
17.4
16.9
45
5175
3615
0.80
0.19
1.13
0.90
17.3
17.1
47.5
5463
3747
0.77
0.18
1.13
0.89
17.2
17.1
G-13
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