Pile Design and Construction Practice, Fifth edition

At 12 m, ultimate unit shaft friction resistance fs 0.012  1  103 12 kN/m^2

At 26 m, fs 0.012  5  103 60 kN/m^2

At 28 m, fs 0.012  8  103 96 kN/m^2

Total shaft friction

Required ultimate base resistance 8 MN/m^2

This resistance is likely to be available at 28 m as an average over a distance of 8 pile
diameters above the toe and 4 diameters below the toe. Over 4 diameters below the toe

(900 2.5933)

/40.45^2  103

(1260) 14 (6096) 2

2

 0.45 933 kN

Resistance of piles to compressive loads 231

0 5

12.0

26.0

Depth below ground level (m)

28.000

Loose becoming

medium-dense

fine sand

46.000

Dense medium-

fine sand

Rock

12.000

2.0

Ground water

15 2520

Cone resistance (MN/m^2 )

5

10

15

20

25

30

35

40

45

Soft silty

clay (cu= 10 kN/m^2 )

Figure 4.44