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# Soil mechanics Q4:- A sand sample is tested in a direct shear device. The vertical normal...

## Question

###### Soil mechanics Q4:- A sand sample is tested in a direct shear device. The vertical normal...
soil mechanics
Q4:- A sand sample is tested in a direct shear device. The vertical normal stress on the sample is 300 kN/m². The horizontal shear stress at failure is equal to 210 kN/m². a. Compute the angle of internal friction for the sand and the magnitudes of the principal stresses at failure. b. During a consolidated drained triaxial test, a sample of the same sand failed at a principal stress difference of 130 kN/m². Determine the magnitudes of the principal stresses at failure.

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