A consolidated-drained tri axial test was carried out on a normally consolidated clay specimen, and the following results were recorded: o = 150 kN/m2 and Aơ, = 260 kN/m".An identical specimen from the same clay was subjected to a consolidated-un drained test with a confining pressure of 150 kN/m2, and the additional axial stress at failure was 115 kN/m2. . What is the pore water pressure at failure in this second specimen? b. What is Skempton's pore pressure parameter A at failure

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