$13-7$ A long strip footing $1\mathrm{.}25$ m wide is used to sup

port the perimeter masonry bearing walls for a

warehouse building. The soil underlying the

building area is a clay where the undrained shear

strength is $40$ kPa $($use zero for the angle of in$-$

ternal friction$),$ and the soil unit weight is $16$

$k\frac{N}{m^3}.$ The rigidity index for the clay is $9.$ The

foundation is constructed $1$ m below the ground

surface, and the soil backfill is well compacted.

Applying the extended bearing capacity equation

with a factor of safety of $3,$ calculate the maxi$-$

mum load to be carried by the foundation, per

meter of length.