Pile Design and Construction Practice, Fifth edition

100

0

5

10

15

20

25

30

0 25 50 75 100

Blows per 100 mm penetration

Penetration depth-feet

125 150

90

80

70

60

50

40

30

20

10

Loose fine

sand

Very soft to

soft sandy silty

clay

355 × 355 mm (14 99 sq)

precast concrete piles

(average of 6 piles)

Stiff to very stiff

sandy silty clay

with gravel

Stiff to very stiff

sandy silty clay

Penetration depth

• m

Dense to very dense

silty sand

(N 5 60)

Dense gravel

and cobbles

(N 5 36)

Very stiff sandy

silty clay and

gravel

200 300

Blows per foot penetration

Note:

400 500

H-piles and precast concrete piles

driven by Delmag D-22 Hammer

Pile heads spalling

355 × 368 mm (14 99 × 14½ 99 ) × 174 kg/m

H-piles (average of 6 piles)

Figure 2.18Comparison of driving resistance of 355355 mm precast concrete piles and
355 368 mm H-section piles driven into glacial clays, sands, and gravels in Hartlepools
Power Station.