The reduction in volume during compaction is mainly due to the air expulsion of the pores and rearrangement of the particles resulting in their close packing. The compaction of soil mass leads to an increase in dry density. The obtained dry density depends on the amount, volume and type of condensation of water. The amount and type of compaction determine the condensation effect. For a specific amount of compaction energy applied to the soil, the mass attains the maximum dry density at the particular water content. This water content is referred to as optimum water content,
When a soil is compacted, it changes its engineering properties and thus behaves differently. Some of the engineering properties that change upon application of compaction effort are briefly described below.
The effect of compaction is to reduce the permeability. In the case of fine-grained soils, it has been found that soils that are wet from optimum for the same dry density will be less permeable than those that are compacted dry of optimums.
In the case of soil samples initially saturated and having the same void ratio, it has been found that soils compacted on a wet side in the low pressure range are more compact than soils compacted on the dry side, and vice versa in the high pressure range. Happens in
3. pore pressure
In unsupervised shear testing performed on saturated soil samples, it has been found that lower pore pressures develop at lower strains when the sample is drier than optimum, as compared to the case when the sample is wetted from optimum. Huh. But the evolution of the pore pressure is the same for the same density and water content at higher strains in both types of samples.
4. stress-strain relationship
Dry samples of optimum production yield a more stable strain–starine curve with peaks at low strains, whereas wet compressed of samples optimum, which have similar densities, produce much higher strain–strain curves with increasing strain even at higher strains. curves are generated.
5. shrinkage and swelling
Optimum shrinking soil at the same density shrinks significantly less than Optimum’s compacted wet. Furthermore, Optimum’s sol compacted dry exhibits higher swelling characteristics than Optimum’s wet compacted samples of the same density.
Also read: Factors Affecting Soil Compaction At Site
Also read: Difference Between Soil Compaction And Consolidation
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