Refer to Fig. $12\mathrm{.}49$b$,$ Let $L=18m,g_{\text{f}\text{i}\text{l}\text{l}}=17k\frac{N}{m^3},g_{\text{s}\text{a}\text{t}(clay)}=19\mathrm{.}8k\frac{N}{m^3},F_{(clay)}={20}^0,H_f=3\mathrm{.}5m,$ and D $($pile diameter$)=406mm.$ The water table coincides with the top of the clay layer. Determine the total downward drag force on the pile. Assume $d^{\text{'}}=0\mathrm{.}6F_{(clay)}^{\text{'}}.$

Negative Sikin Firietion