Civil Engineering MCQJE Level Civil Engineering
The 'submerged unit weight' (γ') of a soil is related to saturated unit weight (γsat) and water unit weight (γw) by:
Soil MechanicsSoil MechanicsEASY
Choose the correct answer
A
γ' = γsat × γw
B
γ' = γsat − γw
C
γ' = γsat + γw
D
γ' = γw/γsat
Correct Answer
B. γ' = γsat − γw
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γ' = γsat − γw (submerged / buoyant unit weight). This is the effective unit weight of soil below water table; accounts for buoyancy of pore water. Typical values: γsat ≈ 18–22 kN/m³; γw = 9.81 kN/m³; γ' ≈ 8–12 kN/m³. Used in bearing capacity, settlement, retaining wall calculations below water table.
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