A 400 mm × 400 mm square precast concrete pile of 15 m length is driven into a sand where γ = 18.0 kN/m³ and ϕ' = 33°. Assuming δ' = 0.7ϕ' and K = 1.4 K_o, determine the load-carrying capacity of the pile with a factor of safety of 3. Use Meyerhof’s method [Eq. (12.18)] for computing the point load-carrying capacity Q_p, and Eqs. (12.42) and (12.43) for computing the load-carrying capacity of the pile shaft Q_s.

Eq. (12.18)

Eq. (12.42)

L' ≈ 15D

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Q, = Apq'N, s A,qi