Question

The minimum bearing capacity of a soil under a given footing occurs when the groundwater table location is at:

• A. the base of the footing
• B. the ground level
• C. a depth equal to one-half of the width of footing
• D. a depth equal to the width of footing

Hint:

Remember: Groundwater at ground level reduces effective stress most severely, giving minimum bearing capacity.

Answer 1

The Correct Option is B

Step 1: Effect of groundwater table.
The position of the groundwater table influences the effective stress and, hence, the bearing capacity of soil.

Step 2: Compare cases.
- When groundwater is at a depth greater than the width of footing: No effect.
- When groundwater is at the base of footing: Partial reduction in effective stress.
- When groundwater is at ground level: Maximum reduction in effective stress throughout the soil depth.

Step 3: Conclusion.
Thus, the minimum bearing capacity occurs when the groundwater table is at ground level.