$12\mathrm{.}3$ A soil profile is shown in Figure $12\mathrm{.}30$ along with the standard penetration numbers in the clay layer. Use Eqs. $12\mathrm{.}5$ to determine and plot the variation of $c_u$ with depth. Use $K=4\mathrm{.}4k\frac{N}{m^2}.$

FIG. $12\mathrm{.}30$