Following are the results of consolidated-undrained triaxial tests on undisturbed soils retrieved from a 4-m-thick saturated clay layer in the field (γsat = 19 kN/m3).
a. Estimate graphically the Mohr-Coulomb shear strength parameters c' and Ï•'.
b. Estimate the shear strength in the middle of the clay layer.

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Chamber pressure, r3 (kN/m2) 100 200 300 Deviator stress,Pore pressure at failure, (alef (kN/m2) 15 -40 -80 (Ard) (kN/m Test no. 170 260 360