Civil Engineering Reference
In-Depth Information
Table 4.1
Shaft capacity with depth
Cumulative shaft capacity, MN
Depth (m)
Present approach
Parry (1980)
5
0
1.3
10
5.6
4.9
15
10.8
10.7
20
16.3
17.6
25
22.9
24.0
30
28.4
29.7
35
33.1
35.0
40
38.0
40.2
45
43.2
45.6
50
48.6
51.2
Figure 4.12
Criteria for axial pile capacity (Semple and Rigden, 1984).
a multiplicative correction factor,
F
, shown in Figure 4.12. An alternative correlation
has been suggested by Kolk and van der Velde (1996), with the shaft friction given by
40
L
0
.
2
55
c
0
.
7
u
σ
0
.
3
v
τ
s
=
0
.
(4.18)
/
d
4.1.2.4 Driven piles: effective stress approach
Chandler (1968) described a more fundamental approach, considering the bond
between pile and soil as purely frictional in nature, with the resulting shaft friction
