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Void ratio is defined as
VvтАЛ/VsтАЛ
VvтАЛ/V
VsтАЛ/VvтАЛ
V/VvтАЛ
VvтАЛ/VsтАЛ
Void ratio (e) is a fundamental dimensionless index property of soil, defined as the ratio of the volume of voids (VvтАЛ) to the volume of solids (VsтАЛ) in a given soil mass.
Void ratio (e) is a fundamental dimensionless index property of soil, defined as the ratio of the volume of voids (VvтАЛ) to the volume of solids (VsтАЛ) in a given soil mass.
e=VsтАЛVvтАЛтАЛ тАФ fundamental definition of void ratio
e=1тИТnnтАЛ тАФ relationship with porosity (n)
In soil mechanics, a soil mass is conceptualized as a three-phase system consisting of solids, water, and air. The void ratio quantifies the relative space available for fluids (air and water) compared to the solid particles, directly influencing the soil's porosity, permeability, and compressibility.
Void ratio (e) is typically expressed as a decimal value.
For coarse-grained soils, e is generally lower; for fine-grained soils, e can be significantly higher.
The value of e can exceed 1.0 (unlike porosity n, which is always less than 1.0).
It is a critical parameter for calculating density index and settlement of foundations.
Used to classify soil density.
Directly correlates with engineering parameters like hydraulic conductivity and compressibility.
Does not inherently indicate soil moisture content without knowing the degree of saturation.
Foundation engineering for settlement prediction.
Geotechnical site characterization.
Estimation of soil permeability.
Option B (VvтАЛ/V) defines porosity (n).
Option C (VsтАЛ/VvтАЛ) represents the inverse of the void ratio.
Void ratio is always greater than 0, with no upper theoretical limit.
A is correct тАФ Void ratio is defined as the ratio of volume of voids to the volume of soil solids (e=VvтАЛ/VsтАЛ).
Remember that porosity (n) is defined relative to the total volume (V), whereas void ratio (e) is defined relative to the solids volume (VsтАЛ). This distinction is the most common source of error in competitive exam calculations.