Effect of compaction on properties of soil

 Properties of soil

1.   Soil Structure:-

If the soils compacted at water content less than Optimum Water Content(OMC) usually have a flocculated structure. (Because attractive forces > Repulsive forces between particles)

If the soils compacted at water content more than Optimum Water Content(OMC) usually have a dispersed structure. (Because attractive forces < Repulsive forces between particles)

2.   Permeability

Permeability of soil depends upon the size of voids.  The minimum permeability occurs at or slightly above the OMC. Beyond OMC, the permeability shows a slight increase.

3.   Compressibility

At low-stress value, a soil compacted wet side (dispersed soil) of the optimum is more compressible than the soil compacted dry side (flocculated soil) of optimum. And at high-stress value is vice versa.

4.   Swelling

 More swelling occurs on the dry side of optimum because a soil on the dry side of optimum has a higher water deficiency and a more random particle arrangement.

5.   Shrinkage

Soil compacted on the wet of optimum tends to exhibit more shrinkage upon drying than those compacted on the dry of optimum.

6.   Shear Strength

The shear strength of the compacted soils depends upon the soil type, the moulded water content, drainage conditions and the method of compaction.

   

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