Pile Design and Construction Practice, Fifth edition

The deflections at various points below the sea bed are obtained from Figures 6.29a and
6.29b, taking as a first trial R 3.78, corresponding to a kvalue from equation 6.11 of
about 24 MN/m^2. Required penetration depth is , say 14 m. Then

From equation 6.30, MA 10.9 MmMNm

From equation 6.32, MNm

From equation 6.31, yA 10.93.78 mm

(^2) 1 000
2  105 0.024
ym 32.4ym
MB 0.4213.78Mh 1.6Mh
Zmax 14
3.78

3.7

3.53.78 13.2

Piling for marine structures 427

Figure 8.19

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

Deflection y (mm)

550

500

450

400

350

300

250

200

150

100

50

x 5 2.5 m below sea bed

2.0

1.5 1.0

0.5

0.0

3 yc 5 97 mm

(^20015) yc 5 487 mm
550
500
450
400
350
300
250
200
150
100
50
0
Soil resistance
p in kN per m of depth
2.5
2.0
1.5
1.0
0.5
0 5 10 15 20
Es in kN/m^2 /m×1 000 per metre
Depth below sea bed (m)
0 2.0 4.0 6.0 8.0
8.0
6.0
4.0
2.0
0
1st trial
2nd trial
Equality line
R, obtained
R, tried
(b)
(c)
(a)
1st trial value
Es 5 8 kN/m^2 /m×1 000
2nd trial value
Es 5 8 kN/m^2 /m×1 000