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For fully dry soil, degree of saturation is
0
1
5
none of the above
0
The degree of saturation (SrтАЛ) is defined as the ratio of the volume of water (VwтАЛ) to the volume of voids (VvтАЛ) in a soil mass. For a fully dry soil, there is no water present in the voids (VwтАЛ=0), resulting in a degree of saturation equal to 0.
The degree of saturation (SrтАЛ) is defined as the ratio of the volume of water (VwтАЛ) to the volume of voids (VvтАЛ) in a soil mass. For a fully dry soil, there is no water present in the voids (VwтАЛ=0), resulting in a degree of saturation equal to 0.
SrтАЛ=VvтАЛVwтАЛтАЛ тАФ Fundamental definition of degree of saturation
In the three-phase system of soil, the total volume consists of solids, water, and air. When soil is perfectly dry, all voids are filled with air. Therefore, substituting VwтАЛ=0 into the definition formula yields SrтАЛ=0.
Degree of saturation is expressed as a decimal or percentage (0 to 1 or 0% to 100%).
SrтАЛ=0 indicates a completely dry state.
SrтАЛ=1 (or 100%) indicates a completely saturated state (all voids filled with water).
Partial saturation occurs when 0<SrтАЛ<1.
Useful for determining the state of soil compaction.
Essential parameter for calculating the unit weight of soil.
Geotechnical stability analysis.
Permeability and seepage studies.
Compaction control in earthwork projects.
Option B (SrтАЛ=1) represents a fully saturated soil where no air is present.
Option C (SrтАЛ=0.5) represents partially saturated soil where 50% of the voids are filled with water.
A is correct тАФ The degree of saturation for a fully dry soil is 0 because the volume of water present in the soil voids is zero.
Remember that SrтАЛ=0 for dry soil and SrтАЛ=1 for saturated soil; this boundary condition is frequently used to simplify the relationship Se=wG in soil mechanics problems.
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