Problem $3$

A subsurface exploration was conducted and it is discovered that the subsurface soils are primarily stiff sandy clays. Given the spacing of some of the columns it is decided that strip footings would best support them. The proposed footing contiguration is shown below. Determine the ultimate loads that can be supported by the footing shown if is founded at a depth of $40$ feet below the ground surface. The groundwater was found to be at a depth of $8$ f below the ground surface A ssume the rectangular foundation is rigid and that the loads from both columns are uniformly supported by the footing Use a factor of safety of $3.$ Do not solve this using mat foundation techniques.

$18$ in

$8ft$

$c^{\text{'}}=500l\frac{b}{f}{t}^2$

$=120\mathrm{.}6l\frac{b}{f}{t}^3$

${}^{\text{'}}=12$

$c^{\text{'}}=300l\frac{b}{f}{t}^2$

${}_{\text{s}\text{a}\text{t}}=126\mathrm{.}6l\frac{b}{f}{t}^3$

${}^{\text{'}}=10$