Pile Design and Construction Practice, Fifth edition

Soil resistance p in kN per m of depth
(a)
550
500
450
400
350
300
250
200
150
100
50
0
Depth below sea bed (m)
(b)
0.5
1.0
1.5
2.0
2.5
Figure 8.19
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Deflection y (mm)
Es in kN/m
0 5 10 15 20
2 /m × 1 000 per metre
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 k value from equation 6.11 of
about 24 MN/m2 . Required penetration depth is 3.5 � 3.78 � 13.2,
say 14 m. Then
Zmax � 14
� 3.7
3.78
1st trial value
E s 58 kN/m 2 /m × 1 000
2nd trial value
E s 5 8 kN/m 2 /m × 1 000
From equation 6.30, MA � 10.9 Mm MNm
From equation 6.32, MNm
From equation 6.31, yA � mm
10.9 � 3.782 � 1000
2 � 105 � 0.024 y MB � 0.421 � 3.78 � Mh � 1.6Mh m � 32.4ym Piling for marine structures 427
x 5 2.5 m below sea bed
2.0
1.5
1.0
0.5
0.0
3 y c 5 97 mm
(c)
8.0
R, obtained
6.0
4.0
2.0
1st trial
Equality line
200
2nd trial
550
500
450
400
350
300
250
200
150
100
50
15 y c 5 487 mm
0
0 2.0 4.0
R, tried
6.0 8.0