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Factors affecting Compaction

Sheep-foot ro...

Question

Sheep-foot rollers are recommended for compacting

A

granular soils

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B

cohesive soil

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C

hard rock

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D

any type of soil

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Solution

The correct option is B cohesive soil
Sheepsfoot rollers are used for compacting fine grained soils such as heavy clays and silty clays. Sheepsfoot rollers are used for compaction of soils in dams, embankments, subgrade layers in pavements and rail road construction projects. These are of static and vibratory types. Vibratory types rollers are used for compaction of all fine grained soils and also soil with sand-gravel mixes. Generally this roller is used for compaction of subgrade layers in road and rail projects.

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Q. Directions: The following items consists of two statements; one labelled as ' Assertion (A)' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:

Assertion (A): The efficiency of the sheep foot roller depends on the weight of the roller and the number of 'feet' in contact with the ground at a time.

Reason (R): Sheep foot rollers are considered most suitable for compacting clayey soils.

Q. Match List-I (Equipment) with List-II (Purpose) and select the correct answer using the codes given below the lists:
List - I
A. Sheep foot roller
B. Frog hammer
C. Vibratory roller
List - II
1. To density cohesionless soils to relatively larger depths.
2. To compact lumpy cohesive soil fills
3. To compact soils at corners and places which bigger rollers cannot access.
4. To compact cohesionless soils of shallow depth

Q. Match List - I with List - II and select the correct answer using the codes given below the lists:
Lists-I
A. Smooth wheel rollers
B. Sheep foot rollers
C. Pneumatic tyred rollers
D. Rammers

Lists-II
1. Most suitable for compacting cohesive soils
2. Most suited for compacting coarse grained soils
3. Used for compacting soils in confined places
4. Suitable for both cohesionless and cohesive soils.

Q. Match List-I (Equipment) with List - II (Use) and select the correct answer using the codes given below the lists:
List - I
A. Vibratory rollers
B. Sheep foot rollers
C. Frog hammers
D. Vibrofloats

List - II
1. To compact soils in confined areas and at corners
2. To compact road and railway embank-ments of sandy soils
3. To densify sandy soils over a large area and to a large depth
4. To compact clayey soil fills.

Q. Compaction of an embankment is carried out in 500mm thick layers. The rammer used for compaction has a foot area of 0.05

m^{2}

and the energy imparted in every drop of rammer is 400 N-m. Assuming 50% more energy in each pass over the compacted area due to overlap, the number of passes required to develop compactive energy equivalent to Indian Standard light compaction for each layer would be

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