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Question

Consider the following:
1. Increase in shear strength and bearing capacity
2. Increase in slope stability
3. Decrease in settlement of soil
4. Decrease in permeability
Which of the above with respect to compaction of soil is/are correct?

A
1 only
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B
1 and 2 only
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C
2 and 3 only
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D
1, 2, 3 and 4
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Solution

The correct option is D 1, 2, 3 and 4
Compaction is the application of mechanical energy to a soil so as to rearrange its particles and reduce the void ratio.
It is applied to improve the properties of an existing soil or in the process of placing fill such as in the construction of embankments, road bases, runways, earth dams, and reinforced earth walls. Compaction is also used to prepare a level surface during construction of buildings. There is usually no change in the water content and in the size of the individual soil particles.
The objectives of compaction are:
  • To increase soil shear strength and therefore its bearing capacity.
  • To reduce subsequent settlement under working loads.
  • To reduce soil permeability making it more difficult for water to flow through.

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