A foundation $2\mathrm{.}25$ m square is supported by saturated clay. The unit

weight of this clay is $18\mathrm{.}6$ kN$/$m$3.$ The depth of the foundation is $1\mathrm{.}2$ m$.$

Determine the ultimate bearing capacity of this foundation assuming that $[$laboratory unconsolidated$-$undrained triaxial $($static$)$ test results$]$:

Undrained cohesion, cu $=90$ kPa

Strain$-$rate factor $=1\mathrm{.}4$