Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 24 (Q.No. 8)
8.
Given below are methods of compaction :
1. Vibration technique
2. Flooding the soil
3. Sheeps-foot roller
4. Tandem roller
5. Heavy weights dropped from a height.
The methods suitable for cohesionless soils include
1. Vibration technique
2. Flooding the soil
3. Sheeps-foot roller
4. Tandem roller
5. Heavy weights dropped from a height.
The methods suitable for cohesionless soils include
Discussion:
2 comments Page 1 of 1.
Subhan said:
3 weeks ago
The correct answer is (c) 1, 2, 5.
Cohesionless soils (like sand and gravel) are best compacted using methods that rearrange particles through vibration or impact.
1. Vibration technique: Highly effective for non-cohesive soils as it reduces friction between particles.
2. Flooding the soil: Water acts as a lubricating agent in granular soils, allowing particles to settle into a denser state.
5. Heavy weights dropped from a height (Dynamic Compaction): The impact energy is very effective for deep compaction of loose sands.
Why others are excluded:
3. Sheepfoot roller: Specifically designed for cohesive (clayey) soils because it provides kneading action.
4. Tandem roller: Generally used for finishing surfaces or thin layers of granular material, but not as characteristic for primary cohesionless soil compaction as the others listed.
Cohesionless soils (like sand and gravel) are best compacted using methods that rearrange particles through vibration or impact.
1. Vibration technique: Highly effective for non-cohesive soils as it reduces friction between particles.
2. Flooding the soil: Water acts as a lubricating agent in granular soils, allowing particles to settle into a denser state.
5. Heavy weights dropped from a height (Dynamic Compaction): The impact energy is very effective for deep compaction of loose sands.
Why others are excluded:
3. Sheepfoot roller: Specifically designed for cohesive (clayey) soils because it provides kneading action.
4. Tandem roller: Generally used for finishing surfaces or thin layers of granular material, but not as characteristic for primary cohesionless soil compaction as the others listed.
Satnam said:
5 years ago
Please explain in detail.
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