Assessing the value of information to design site investigation and construction quality assurance programs - Risk and Reliability in Geotechnical Engineering - page 508

0.8

Proof load=800 kN

0.7
0.6
0.5
0.4

Proof load=1000 kN

Proof load=400 kN

0.3
0.2
0.1

Proof load=1200 kN

0

0 2 4 6

Number of proof load tests

8 10 12

Figure 13.32 Value of information verus number of proof load tests for pile foundation design.

13.5 CaSe-hIStorY aPPlICatIonS

Four case-history applications are presented to illustrate the use of a value of information
assessment in practice.

13.5.1 Site investigation for foundation design
A common need for a value of information assessment in practice is to decide how many soil
borings to drill for the design of a foundation. Figure 13.33 shows an offshore structure with
steel pipe pile foundations. Random variable models have been developed based on the exist-
ing geotechnical data for offshore fields in a variety of different geologic settings (e.g., Gilbert
et al. 1999a, b, 2008; Gambino and Gilbert 1999; Cheon and Gilbert 2014). Example mod-
els for the side capacity of steel pipe pile are shown in Figure 13.34 . The geological setting

Figure 13.33 Steel pipe piles being inserted into and then driven through legs of steel jacket into seafloor
for offshore oil platform.