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QUESTION 4 (20 marks) Following information is reported on the basis of a direct shear test...

QUESTION 4
Following information is reported on the basis of a direct shear test conducted on dry sand;
• Specimen dimension: 50mm x 50mm x 30 mm
• Gs=2.7
• Normal stress: 100+30 kPa
• Angle of friction: 330
a) Determine the shear force required to cause failure
b) What was the mass of the sample if the initial void ratio of the sample is 0.68.
c) A second test was conducted on the same sand at the same void ratio under the normal stress of 200+30 kPa. What is the shear stress required to cause the failure?

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