Compaction: slow the flow
Compaction is the predominant method of soil improvement and is vital in designing retaining walls, earth fill dams and embankments.
The relationship between changes in void ratio, through compaction, and the resultant effects on soil-water properties, is uncertain.
The initial aim required a thorough understanding of the saturated soil properties of the material being investigated. Subsequently, the compactive efforts of the soil were varied to determine the effects on soil-water characteristics and unsaturated permeability. A scale model was also created with the intent to corroborate these results and provide a visual representation of the testing. A combination of theoretical and experimental analysis was undertaken, through the use of multiple laboratory apparatus, to quantify the impact of compaction on soil-water behaviour.
The results obtained support the initial assumption suggesting as the void ratio decreases, the unsaturated coefficient of permeability decreases and the suction at which air enters the voids is reduced.
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