Civil Engineering MCQAE Level Civil Engineering
In the Swedish (Fellenius) method for slope stability analysis of a circular failure surface, the factor of safety is:
Soil MechanicsSwedish Method Factor of SafetyMEDIUM
Choose the correct answer
A
Σ(cΔl + N tanφ) / ΣT
B
Σ(cΔl + N tanφ) / ΣW sinα
C
Both are equivalent (N = W cosα, T = W sinα)
D
Neither is correct
Correct Answer
C. Both are equivalent (N = W cosα, T = W sinα)
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FS = Σ(cΔl + W cosα tanφ) / Σ(W sinα), where W = slice weight, α = angle of base of slice to horizontal, Δl = arc length of base. Both expressions are equivalent since N = W cosα and T = W sinα.
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