1. You conduct a series of CU triaxial tests on saturated clay. After reducing the raw data, you reach the conclusions shown in Table 1. a. Determine the equation of the undrained Mohr-Coulomb failure envelope. b. Determine the equation of the drained Mohr-Coulomb failure envelope. c. Is the clay normally consolidated or over-consolidated? Why? Table 1. Triaxial test data. Test Cell pressure, Ocell (kPa) Excess pore pressure, Deviatoric pressure, u (kPa) Odev (kPa) 1 2 150 80 192 300 154 341 3 450 222 504 2. You test another sample of the same soil from Problem 1 in direct shear. You choose a normal pressure of 325 kPa. What do you expect the shear stress at failure to be? What do you expect the major and minor principle stresses at failure to be?