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sma02 - Basic Definitions and Terminology Solid Va Water V...

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Basic Definitions and Terminology

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Soil is generally a three phase material Contains solid particles and voids Voids can contain liquid and gas phases Solid Water Air V s V w V a
Soil is generally a three phase material Contains solid particles and voids Voids can contain liquid and gas phases Solid Water Air V s V w V a

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Soil is generally a three phase material Contains solid particles and voids Voids can contain liquid and gas phases Solid Water Air Phase Volume Mass Weight Air V a 0 0 Water V w M w W w Solid V s M s W s V s V w V a
Units Length metres Mass tonnes (1 tonne = 10 3 kg) Density t/m 3 Weight kilonewtons (kN) Stress kilopascals (kPa) 1 kPa= 1 kN/m 2 Unit weight kN/m 3 Accuracy Density of water, ρ w = 1 t/m 3 Stress/Strength to 0.1 kPa

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Weight and Unit weight Force due to mass (weight) more important than mass W = M g Unit weight
Weight and Unit weight Force due to mass (weight) more important than mass W = M g Unit weight γ = ρ g

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Weight and Unit weight Force due to mass (weight) more important than mass W = M g Unit weight γ = ρ g σ v z σ v = ρ g z σ v = γ z
Specific Gravity G s 2245 2.65 for most soils G s is useful because it enables the volume of solid particles to be calculated from mass or weight G Density of Material Density of Water w = = ρ ρ G UnitWeight of Material UnitWeight of Water w = = γ γ This is defined by

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Specific Gravity G s 2245 2.65 for most soils G s is useful because it enables the volume of solid particles to be calculated from mass or weight G Density of Material Density of Water w = = ρ ρ G UnitWeight of Material UnitWeight of Water w = = γ γ This is defined by V M M G W W G s s s s s w s s s s w = = = = ρ ρ γ γ
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sma02 - Basic Definitions and Terminology Solid Va Water V...

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