Direct Shear Test Calculations| Shear Parameters from DST results

In this video, we are going to learn how to calculate the value of shear parameters i.e cohesion and angle of internal friction from Direct Shear Test (DST) results, and use these parameters to find the value of failure load in the Triaxial Test.
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Question: A series of undrained shear box tests (A = 360 mm2 ) were carried out on soil with the following results:
a) Determine the cohesion (c)
b) Determine the angle of friction(φ)
c) If a 30 mm diameter and 70 mm long sample of the same soil was tested in a tri-axial machine with a cell pressure of 270 kPa, what would be the additional axial load at failure?