The data from a series of consolidated-undrained triaxial tests are summarized below. Draw the three Mohr circles, plot the failure envelope in terms of effective stresses, and find c' and f'.

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Additional axial Pore water Sample Cell pressure stress at failure (kN/m?) (kN/m?) pressure at failure (kN/m?) number 1 100 88.2 57.4 200 138.5 123.7 3 300 232.1 208.8