A 4 × 6 pile group is driven into a sand where γ = 19 kN/m3 and φ ́= 33°. The center-to-center spacing is 1.2 m. Each co

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A 4 × 6 pile group is driven into a sand where γ = 19 kN/m3 and
φ ́= 33°. The center-to-center
spacing is 1.2 m. Each concrete pile has a diameter of 400 mm and a
length of 20 m. Assuming δ ́
= 0.7 φ ́and K = 1.5 K0, determine the load carrying capacity of
the pile group, with a factor of
safety of 3.