Table G-3
Calculation of settlement of sand above ground water table ..
Water Table at 20 ft
Design Earthquake:
γ= 115 pcf
PGA = 0.25 g
t
Mw =
6.75
1
σo
γf
γf
εv, Mw=7.5
εv, Mw=6.75
2ε
rd
N1
Gmax
Depth
Thickness
ef
ef
(Geff/Gmax)
ft
ft
psf
psf
%
%
5
7.5
575
0.99
10
8.44E+05
1.1E-04
2.2E-04
0.05
0.04
10
5
1150
0.98
10
1.19E+06
1.5E-04
2.8E-04
0.07
0.06
15
7.5
1725
0.97
10
1.46E+06
1.9E-04
3.4E-04
0.09
0.08
1
1/3
1/2
* (σm') * 1000
: Gmax = 20 * (N1)
Total Settl
Table G-4
Scaling factors for influence of earthquake magnitude on volumetric strain for dry sands (fr
Seed, 1987).
Earthquake
εM=m / εM=7.5
Mw
8
1.25
7
1.00
6:
0.85
6
0.60
0.40
53
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