In a tri-axial test of normally consolidated clay, the sample is subjected to chamber of confining pressure of 275 kPa and failed when deviator stress is 375 kPa. 1. Which of the following gives the angle of internal friction?  a. 29.32° b. 32.29° c. 22.29° d. 23.92° 2. Which of the following gives the shear stress at failure?  a. 187.50 kPa b. 342.79 kPa c. 171.40 kPa d. 205.12 kPa 3. Which of the following gives the effective normal stress at maximum shear?  a. 462.50 kPa b. 605.00 kPa c. 512.50 kPa d. 325.00 kPa

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