Which of the following statements is correct with respect to compaction and consolidation?

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SSC JE Civil 9 Oct 2023 Shift 1 Official Paper-I
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  1. Compaction is valid for cohesive soils, whereas consolidation is applicable for all types of soils.
  2. Compaction releases pore water, whereas consolidation releases pore air.
  3. Both compaction and consolidation degrade the engineering properties of soil.
  4. Both compaction and consolidation improve the engineering properties of soil.

Answer (Detailed Solution Below)

Option 4 : Both compaction and consolidation improve the engineering properties of soil.
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Detailed Solution

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Explanation:

Compaction

  • Compaction is defined as the instantaneous process to decrease the volume of soil and increase the density of soil (or densification of soil) by the decreasing volume of air voids at a given water content due to applying of mechanical energy (sudden or impact load)

Consolidation

  • Consolidation is defined as the process to decrease soil volume and increase the density of soil by the squeezing out (expulsion) of the pore water on account of the gradual dissipation of excess hydrostatic pressure induced by an imposed total stress.

 Additional Information

Compaction Consolidation
It is an almost instantaneous phenomenon. It is a time-dependent phenomenon.
Soil is always unsaturated. Soil is completely saturated.
Densification is due to a reduction in the volume of air voids at a given water content. Volume reduction is due to the expulsion of pore water from voids.
Specified compaction techniques are used in this process. Consolidation occurs on account of a load placed on the soil.
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