In case of well foundations, sinking of the well is facilitated by using _______
- ASquare Wells
- BCircular WellsCorrect
- CRectangular Wells
- DTriangular Wells
Solution
Concept
Circular wells sink more easily than other shapes.
Step-by-step solution
1. Sinking means the well goes down by its own weight while soil is dredged out from inside. 2. A circular well has the lowest skin friction for its area. 3. It has no corners, so it is easy to dredge and stays more stable. 4. It is also less likely to tilt. 5. So the answer is B.
Explanation
A circular well has the least surface area for its cross-section, so it has less skin friction. Dredging is uniform and there are no corners where soil gets stuck. This makes sinking easier and tilting less likely.
Why the other options are wrong
A, C and D have corners or sides that increase friction and make dredging harder. Triangular wells are not used in practice.
Shortcut
Circular = easiest sinking, least tilt.
Common mistake
Choosing rectangular because it fits piers better.
Correct answer: B) Circular Wells