Question: A straight drilled shaft 1.0 m in diameter and 15.0 m long is installed in a sand where ' = 34 and = 18.0

A straight drilled shaft 1.0 m in diameter and 15.0 m long is installed in a sand where ϕ' = 34° and γ = 18.0 kN/m3.

a. Determine the load-carrying capacity at the base using the Chen and Kulhawy (1994) method.

b. Determine the load-carrying capacity at the base using the Berezantzev et al. (1961) method.

c. Determine the load-carrying capacity of the shaft, assuming δ'/ϕ' = 0.9.

d. With FS = 3, what would be the maximum load that can be allowed on the drilled shaft?

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