In the stability analysis of slopes, the factor of safety using the Swedish (slip circle) method is:
Choose the correct answer
Sum of disturbing moments / sum of resisting moments
Resisting force / driving force on the slip surface
Shear strength / shear stress on the circular arc
Both A and C give the same result for circular arc
Correct Answer
D. Both A and C give the same result for circular arc
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For a circular slip arc, the factor of safety = (ΣResisting moments)/(ΣDriving moments) = Σ(c'×l + N'×tanφ')×R / ΣW×d, which is also equal to shear strength / shear stress averaged along the slip circle.
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