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Problem #3 [3 points) Solve exercise problem 11.29 from the textbook. Hint: If using Microsoft Excel, do not forget to convert radian to degrees. FYI: atan() for tan inverse) function in Microsoft Excel returns the output as radians. Alternatively use: DEGREES(ATAN(slope)) Or ATAN(slope)*180/pi
11-29. A silty sand is tested consolidated-drained in a triaxial cell where both principal stresses at the start of the test were 500 kPa. If the total axial stress at failure is 1.63 MPa while the horizontal pressure remains constant, compute the angle of shearing resistance and the theoretical orientation of the failure plane with respect to the horizontal.
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