What is soil compaction? Write its objectives.

Compaction of soil may be defined as the process of packing the soil particles by reducing the air voids in the soil, by mechanical means.

The degree of compaction of soil is characterized by its dry density. In the construction of highway embankments, earth dams, and many other engineering projects, loose soil must be compacted to increase its unit weight.

Objective of compaction

  1. Compaction increases the dry density of soil, thus increasing shear strength and bearing capacity through an increase in frictional characteristics.
  2. Decreasing the undesirable settlement of structures.
  3. Control undesirable volume changes.
  4. Compaction brings about a low permeability of the soil.
  5. Increasing the stability of slopes.

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