$18\mathrm{.}6$ Determine the maximum load that can be allowed on a $450$ mm diameter driven pile shown in Figure $18\mathrm{.}34,$ allowing a safety factor of $3.$ Use $K=1\mathrm{.}5K_o$ and ${}^{\text{'}}=0\mathrm{.}65{}^{\text{'}}.$

FIG. $18\mathrm{.}34$

Answer:$375\mathrm{.}1$ kN