Example $14\mathrm{.}23$: A loading test was conducted with a $300$ mm square plate at depth of $1$ m

below the ground surface in pure clay deposit. The water table is located at a depth of $4$ m

below the ground level. Failure occurred at a load of $45$ kN $.$

What is the safe bearing capacity of a $1\mathrm{.}5$ m wide strip footing at $1\mathrm{.}5$ m depth in the same soil?