Environmental Engineering Reference
In-Depth Information
Table 14.6
Reliability statistics of single driven piles designed using an FOS of 2.0 and verified by two load tests
Verified by two positive tests, xT
T
>
1.0
Verified by two tests with a mean xT
T
=
1.0
Coefficient of
variation COV
R
Reliability
index
β
Bias
factor
λ
R
Coefficient of
variation COV
R
Reliability
index
β
Prediction method
Bias factor
λ
R
CAPWAP (EOD, Florida database)
1.71
0.32
2.89
1.12
0.24
2.21
CAPWAP (BOR, Florida database)
1.46
0.30
2.62
1.07
0.24
2.07
CAPWAP (EOD, national database)
1.89
0.42
2.58
1.07
0.24
2.05
CAPWAP (BOR, national database)
1.38
0.29
2.54
1.05
0.24
2.02
Energy approach (EOD, Florida database)
1.34
0.28
2.50
1.04
0.24
1.99
Energy approach (BOR, Florida database)
1.22
0.28
2.26
0.98
0.24
1.81
Energy approach (EOD, national database)
1.42
0.31
2.46
1.03
0.24
1.95
Energy approach (BOR, national database)
1.20
0.28
2.22
0.97
0.24
1.78
Alpha method, clay type I
1.12
0.21
2.40
1.09
0.21
2.31
Alpha method, clay type II
2.54
0.52
2.69
1.09
0.24
2.09
Beta method
1.07
0.21
2.22
1.03
0.21
2.10
CPT method
1.33
0.29
2.43
1.02
0.24
1.93
Lambda method, clay type I
1.40
0.32
2.42
1.02
0.24
1.92
Meyerhof's SPT method
1.68
0.39
2.45
1.04
0.24
1.98
Note: (1) Type I refers to soils with undrained shear strength
S
u
<
50 kPa; Type II refers to soils with
S
u
>
50 kPa.
(2)
x
T
= Ratio of the maximum test load to the predicted pile capacity.
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