Civil Engineering MCQAE Level Civil Engineering
A saturated soil mass has total stress σ = 100 kPa and pore water pressure u = 40 kPa. The effective stress σ' is:
Soil MechanicsEffective StressMEDIUM
Choose the correct answer
A
140 kPa
B
40 kPa
C
60 kPa
D
100 kPa
Correct Answer
C. 60 kPa
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Effective stress σ' = σ - u = 100 - 40 = 60 kPa (Terzaghi's effective stress principle). The effective stress controls shear strength, compressibility, and all mechanical behavior of soils.
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