Question: A 4 5 0 mm diameter, 2 0 m long reinforced concrete pile is driven into a stiff clay which has a shear strength profile

A 450mm diameter, 20m long reinforced concrete pile is driven into a stiff clay which has a shear strength profile [cu =75+2.5 z kPa] where z is the depth below the surface. A surcharge of 15kPa is applied to the ground surface. Calculate the negative friction that will act as a result of this surcharge. Assume that the submerged unit weight of the clay is 10kPa.

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