What is the lateral capacity, for loading at the mudline, of a 1m diameter pile

Question

What is the lateral capacity, for loading at the mudline, of a 1m diameter pile that is 10 m long, in soil with a uniform strength of 100 kPa over the whole pile length. You may ignore the possibility of structural failure in the pile, and assume the pile is free to rotate. Assume a lateral bearing factor, Np = P/Ds_u = 9 at all depths. Consider a free body diagram of the pile when failing by rigid body rotation. Assess the horizontal and moment equilibrium with two unknowns being the horizontal capacity (applied at the pile head) and the depth of the point of rotation.

Explanation / Answer

given

P/D*Su = 9

Su= 100 kPa and D= 1m

for each m of length capacity = P= 9*100= 900 Kn

For 10 m of length

capacity = 900*10 = 9000KN

if FOS= 2

working capacity = 9000/2= 4500kN

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