Geotechnical Data and Pile Design - Offshore Structures: Design, Construction and Maintenance - page 284

TABLE 4.19 Minimum Pile Wall Thickness

Pile Diameter, in mm (inches) Nominal Wall Thickness, in mm (inches)

610 (24) 13(1/2)

762 (30) 14(9/16)

914 (36) 16(5/8)

1067 (42) 17(11/16)

1219 (48) 19(3/4)

1524 (60) 22(7/8)

1829 (72) 25(1)

2134 (84) 28(11/8)

2438 (96) 31(11/4)

2743 (108) 34(13/8)

3048 (120) 37(11/2)

TABLE 4.20 Summary of Drivability Analysis for Pile 30 Inches in Diameter

Hammer Achievable Penetration Maximum Driving Stresses

Delmag D-80 27.2 202

MRBS 3000 27.2 220

MRBS 3900 61.5 252

Achievable penetration is based on refusal criteria of 15 blows/0.25 m.

4.10 SOIL INVESTIGATION REPORT
After all soil investigation tests on site and in the laboratory are completed, the
following curves, which assist in pile design, should be presented in the soil
investigation report: the curve for the relationship between the depth below
the seabed and the unit skin friction ( Figure 4.18 ) and the curve for the relation-
ship between the pile depth below the seabed and the unit of end bearing
( Figure 4.19 ).
If the pile diameter is not identified, the study should include the pile capacity in
compression for different pile diameters, as presented in Figure 4.21 , and the pile
capacity in tension for different pile diameters, as shown in Figure 4.22 .