Question $2$

Three consolidated$-$undrained triaxial strength tests with pore water pressure measurement have been conducted on soil samples taken from the same soil horizon. The samples were initially $38mm$ in diameter by $76mm$ long. There was change in volume during consolidation, but no change in volume during the testing $($positive volume changes are compressive$).$ The results are shown in the table below.

Determine an appropriate drained strength envelope for the soil.

$\backslash$table$[[$Test$,\backslash$table$[[$Cell$],[$pressure$,],[k\frac{N}{m^2}$