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100
Mori, Hokkaido
80
Borah Peak, Idaho
60
Port Island, Kobe
40
20
0
0.01
0.1
1
10
100
Particle size (mm)
Fig. 8.2. Typical grain size curves of gravelly soils recently liquefied
(Kokusho et al., 1995)
300
Hokkaido-Morimachi
250
Kobe-Port island
200
Kobe
Mayahuto
150
Typical
sand
100
50
USA-Borah
Peak
0
0.1
1
10
100
Mean grain size D 50 (mm)
Fig.8.3. Meangrainsizeversusuniformitycoefficientrelationshipforrecentlyliquefied
gravelly soils (Kokusho et al.,1995)
Figure 8.4 summarizes undrained cyclic strengths of well-graded gravelly soils plotted
versus SPT N 1 -values ( N -values normalized for effective overburden stress of 98kPa)
based on previous researches (Tanaka et al., 1992; Andrus, 1994; Kokusho et al., 1995;
Inagakietal.,1996).Mostoftheundrainedstrengths(thestressratiofor2%-2.5%double
amplitude strain in 15-20 cycles) were obtained by cyclic triaxial tests on intact samples
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