Problem $1.$

A continuous footing is shown in Figure $16\mathrm{.}17.$ Using Terzaghi's bearing capacity factors, determine the gross allowable load per unit area $(q_{\text{a}\text{l}\text{l}})$ that the footing can carry. Assume general shear failure. Given: $=19k\frac{N}{m^3},c^{\text{'}}=31k\frac{N}{m^2},{}^{\text{'}}=28,D_f=1\mathrm{.}5m,B=2m,$ and factor of safety $=3\mathrm{.}5.$

Figure $16\mathrm{.}17$