Environmental Engineering Reference
In-Depth Information
1200
1000
800
600
400
200
0
-200
-400
Optimal
number of
tests
Savings provided by data
balances the cost of tests
-600
0
5
10
Number of tests
15
20
25
2500
Value of
information
Cost of
information
2000
1500
Savings provided
by data balances
the cost of tests
Maximum
saving
1000
500
Optimal number of tests
0
0
5
10
Number of tests
15
20
25
Figure 13.27 Optimal number of tests obtained by value of information analysis for QA/QC of com-
pacted fill.
10
9
8
7
6
20
18
16
14
Baseline case
12
Baseline case
5
4
3
2
1
0
10
8
6
4
2
0
0
200
400
600
800
1000
0
100
200
Unit cost of the test ($)
300
400
500
Implementation cost reduction per unit
increase in undrained strength ($/kPa)
10
9
8
7
6
10
9
8
7
6
Baseline case
Baseline case
5
4
3
2
1
0
5
4
3
2
1
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
σ x : Standard deviation of X given a mean value
for X (kPa)
σ µ : Standard deviation of the normal
distribution of the mean of X (kPa)
Figure 13.28 Relationship between optimal number of tests and input variables for QA/QC of com-
pacted fill.
 
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