Question

If the major (σ1) and minor (σ3) principal stresses for a rock element have a relationship as σ3 = −$\frac{1}{2}$ σ1, the maximum shear stress is expressed by

• A. $\frac{4}{3}$ σ1
• B. $\frac{3}{4}$ σ1
• C. $\frac{1}{2}$ σ1
• D. $\frac{1}{4}$ σ1

Answer 1

Answer: (B)

$\frac{3}{4}$ σ1

Answer 2

The correct option is (B): $\frac{3}{4}$ σ1