Geoscience Reference
In-Depth Information
0.4
Recommended Curve
for conditions where
void redistribution effects
are expected to be negligible
0.3
0.2
0.1
Recommended Curve
for conditions where
void redistribution effects
could be significant
0.0
0
30
60
90
120
150
180
Equivalent Clean Sand CPT Normalized Corrected Tip Resistance, q
c1Ncs-Sr
Fig. 1.10. Proposed curves for relatingresidual shear strengthratio, S
r
/
σ
vo
,of liquefied
soil tomedian values ofequivalent clean sand CPT normalized corrected tip resistance
for
σ
vo
lessthan 400kPa
The above expressions were used to map the S
r
/
σ
vo
relationship in Figure 1.5 to the
relationship in Figure 1.10 by converting the
N
1
)
60cs
-
Sr
values to q
c1Ncs
-
Sr
values. The
resulting relationships can be closelyapproximated as
S
r
σ
vo
=
(
exp
q
c1Ncs
-
Sr
24
42
q
c1Ncs
-
Sr
61
2
q
c1Ncs
-
Sr
106
3
5
−
+
−
4
.
.
.
7
φ
≤
tan
(1.9)
for thecase where void redistributioncould be significant, and as
S
r
σ
vo
=
exp
q
c1Ncs
-
Sr
24
42
q
c1Ncs
-
Sr
61
2
q
c1Ncs
-
Sr
106
3
5
−
+
−
4
.
.
.
7
1
exp
q
c1Ncs
-
Sr
11
82
φ
×
+
1
−
9
.
≤
tan
(1.10)
.
for thecase where void redistributioneffects areexpected tobe negligible.
4.2. CPTVALUES FORCASE HISTORIES
Estimates of CPT penetration resistances for each of the case histories in Table 1.1 were
obtained using a modified form of the correlation between CPT and SPT penetration
resistances presented by Suzuki et al. (1998). Suzuki et al. showed that the ratio q
c
/
N
