(Solved): A 48 -inch diameter drilled shaft has a bell, Db=8 and is placed 55 -feet deep in sand. The s ...

A 48 -inch diameter drilled shaft has a bell, $D_b=8^{\prime }$ and is placed 55 -feet deep in sand. The soil from the ground down to 40 feet deep has $\gamma =109\#/{\mathrm{ft}}^3$. The layer from 40 feet deep to the bottom has $\gamma =$ $116\#/{\mathrm{ft}}^3$. The soil's angle of internal friction is $27^{\circ }$. If a Factor of Safety of 3.0 is utilized, what is the allowable point capacity, $Q_{p(all)}$ for this drilled shaft? 270 kips 460 kips 875 kips 1,335 kips