Pile Design and Construction Practice, Fifth edition

Modulus of elasticity of pile � 26 � 10 3 MN/m 2
Take a rheological factor of 0.8, then from equation 6.43a:
k m � 67 MN/m 2
Over elastic range from p � 0 to p � pf, then from equation 6.11:
�4 26�10
Stiffness factor � R �
3�0.0155 � 1.68 m
67�0.75
To allow for surface heave assume no soil reaction from ground surface to assumed surface
at 0.5 � 0.75 � 0.375 m
At creep pressure of 0.8 MN/m 2 , corresponding deflection
From equation 6.46 corresponding lateral load applied at assumed ground surface:
H �
From equation 6.47, slope at assumed ground surface
Deflection at real ground surface
0.380 � 0.375
� 0.009 �
2
6 � 26 � 103 � ( � 0.0054 � 0.375)
� 0.0155
� 0.0110 m
� 11 mm
1 2 � 0.6
�
km 9 � 30�0.75 0.8
� 2.65� 0.6
0.0090 � 1.68 � 67 � 0.75
� 0.380 MN
2
2 � 0.380
��
1.682 � 67 � 0.75 ��0.0054 radians
Between p � p f and p � p l the upper curve in Figure 6.34b gives
and
R �� 4 26 � 103 � 0.0155
� 2.00 m
33.5 � 0.75
From upper curve in Figure 6.34b
At limit pressure of 1.8 MN/m 2 corresponding deflection �
�
Piles to resist uplift and lateral loading 373
0.8 � 0.75
6 � 30
�
0.8 � 0.75
67
k m � 67
2 � 33.5 MN/m 2
1.8 � 0.75
33.5
� 0.0090 m
� 0.0403 m