Question

What is the effect of soil compaction on its shear strength?

• A. Decreases shear strength
• B. No effect
• C. Increases shear strength
• D. Makes it zero

Hint:

Remember: Compaction → Higher density → Higher shear strength.

Answer 1

The Correct Option is C

Concept: Soil compaction is the process of densifying soil by reducing air voids, which improves its engineering properties.
Step 1: Understanding compaction.
Compaction increases soil density and brings particles closer together.
Step 2: Effect on shear strength.
As particles become more tightly packed, friction and interlocking between them increase.
Step 3: Result.
This leads to an increase in shear strength of the soil.
Step 4: Evaluating the options.

• Decreases shear strength $\rightarrow$ Incorrect
• No effect $\rightarrow$ Incorrect
• Increases shear strength $\rightarrow$ Correct
• Makes it zero $\rightarrow$ Incorrect

Step 5: Conclusion.
Thus, soil compaction increases shear strength.