A sample of clay (Sample A) is isotropically normally consolidated to cell pressure of 400kPa and

ν0=2.052 (i.e. ν0 is specific volume). A second sample (Sample B) is istropically consolidated to

863kPa and allowed to swell to a mean effective stress of 40kPa when ν0=2.052. Both samples

were then subjected to standard undrained compression tests. The value of the soil constants for

clay are:

M=0.95, =3.15 and =0.19

Find pore pressure at failure of each sample.