In a triaxial compression test, the major principal stress was 90 kPa and the minor principal stress was 30 kPa, at failure. The pore pressure at failure was observed to be 10 kPa. The tangent of the angle of shearing resistance of the sandy soil that was tested was
1
\(\frac{1}{2}\)
2
\(\frac{1}{3}\)
3
\(\frac{2}{3}\)
4
\(\frac{3}{4}\)
5
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