Pile Design and Construction Practice, Fifth edition

Modulus of elasticity of pile 26  103 MN/m^2

Take a rheological factor of 0.8, then from equation 6.43a:

km 67 MN/m^2

Over elastic range from p 0 to p pf, then from equation 6.11:

Stiffness factor R

To allow for surface heave assume no soil reaction from ground surface to assumed surface
at 0.50.75 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:

From equation 6.47, slope at assumed ground surface

Deflection at real ground surface

0.0110 m

11 mm

Between ppfand pplthe upper curve in Figure 6.34b gives
and

From upper curve in Figure 6.34b

At limit pressure of 1.8 MN/m^2 corresponding deflection

1.8  0.75

33.5

0.0403 m

R (^) ^4

26  103 ^ 0.0155

33.5  0.75

2.00 m

km

67

2

33.5 MN/m^2

0.009

0.380  0.375^2

6  26  103 ^ 0.0155

(0.0054  0.375)



2  0.380

1.68^2 ^67  0.75

0.0054 radians

H

0.0090  1.68  67  0.75

2

0.380 MN

0.8  0.75

67

0.0090 m



426 ^103 0.0155

67 0.75

1.68 m

1

km

2  0.6

9  30 

0.75

0.6

 2.65

0.8



0.8  0.75

6  30

Piles to resist uplift and lateral loading 373