The shape of radial shear zones below a shallow footing is
- ACircular
- BParabolic
- CLogarithmic spiralCorrect
- DNone of these
Solution
Concept
Radial shear zone
Step-by-step solution
1. The radial shear zone boundary is a logarithmic spiral.
Explanation
Terzaghi assumes a log spiral.
Why the other options are wrong
Circular and parabolic are not assumed.
Shortcut
Log spiral.
Correct answer: C) Logarithmic spiral