Q. Define Bearing Capacity of Soil. State and explain the factors affecting it.
Definition:
Bearing Capacity of Soil is the maximum load per unit area that the soil can safely support without experiencing shear failure or excessive settlement.
Factors Affecting Bearing Capacity of Soil:
1. Soil Type and Strength
Dense sand and hard clay have higher bearing capacity than loose sand and soft clay.
2. Soil Density
Higher density generally increases the bearing capacity of soil.
3. Moisture Content
Excess water reduces soil strength and decreases bearing capacity.
4. Groundwater Table
A high water table lowers the effective stress in soil, reducing bearing capacity.
5. Depth of Foundation
Bearing capacity generally increases with foundation depth due to greater confinement.
6. Size and Shape of Foundation
Larger and properly shaped foundations distribute loads more effectively.
7. Soil Compaction
Well-compacted soil provides better support and higher bearing capacity.
8. Load Inclination and Eccentricity
Inclined or off-center loads reduce the effective bearing capacity.
9. Drainage Conditions
Poor drainage can weaken soil and decrease its load-carrying capacity.
10. Layering of Soil
Weak layers beneath the foundation can significantly reduce bearing capacity.
Conclusion:
The bearing capacity of soil is a critical factor in foundation design. Proper soil investigation and site assessment are essential to ensure the safety and stability of structures.
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