Question

An undrained triaxial compression test is carried out on a saturated clay sample under a cell pressure of 50 kN/m². The sample failed at a deviator stress of 100 kN/m². The cohesion of this clay sample would be

• A. 25 kN/m²
• B. 50 kN/m²
• C. 75 kN/m²
• D. 100 kN/m²

Hint:

In an undrained triaxial test, cohesion is found using the formula \( C = \frac{{Deviator Stress}}{2} \).

Answer 1

The Correct Option is B

Step 1: Using the cohesion formula. - In an undrained triaxial test, cohesion \( C \) is given by: \[ C = \frac{{Deviator Stress}}{2} \] - Given deviator stress = 100 kN/m². Step 2: Substituting values. \[ C = \frac{100}{2} = 50 { kN/m²} \] Thus, the correct answer is (B) 50 kN/m².