Pile Design and Construction Practice, Fifth edition

0
0
2
4
H/B
6
8
10
Influence factor I�p 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Influence factor I�p 0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
2
4
H/B
6
8
L/B�2
10
k�10 k�5 k�2 k�1 k�0.5 k�0.25 k�0.125 k�0
Influence factor I�p 0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
2
4
H/B
6
8
L/B�3
10
k�10 k�5 k�2 k�1 k�0.5 k�0.25 k�0.125 k�0
Influence factor I�p Base of equivalent raft foundation
0
0
2
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
L/B�5
0.9
D
q
Ef
Eo
4
H/B
6
8
10
k�10 k�5k�2k�1k�0.5k�0.25 k�0.125 k�0
4
H/B
6
Influence factor I�p 0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
2
8
k�10 k�5 k�2 k�1 k�0.5 k�0.25 k�0.125 k�0
L/B�10
10
k�10 k�5 k�2 k�1 k�0.5 k�0.25k�0.125 k�0
Use for L/B>10
L/B�1
H
Ed � Ef
B × L
kH
(1+ )
B
Assumed incompressible
Poisson's ratio � � 0.2
(Ed – Ef) B
k �
×
Ef H
Settlement at corner of loaded area
r
q × B ×
� I�
i � p
Ef
Diagrams applicable for H/B >10
Figure 5.33 Values of influence factor for deformation modulus increasing linearly with depth and
modular ratio of 0.2 in rock (after Meigh (5.23) ).