In Bishop''s simplified method for slope stability analysis:
Choose the correct answer
Inter-slice forces are fully accounted for (rigorous)
Inter-slice shear forces are neglected (zero); only horizontal inter-slice forces may be included — iterative solution for FOS
Failure surface is assumed parabolic
Only for cohesionless soils (c=0)
Correct Answer
B. Inter-slice shear forces are neglected (zero); only horizontal inter-slice forces may be included — iterative solution for FOS
Why is this the answer?
Bishop''s method: divides slope into vertical slices; normal force on base from equilibrium. Simplified method: assumes inter-slice shear forces are zero (not horizontal forces). FOS = Σ[c'b + (W−ub)tanφ']/mα / ΣW sinα where mα = cosα + sinα tanφ'/FOS. Iterative solution needed (FOS appears on both sides). More accurate than Swedish circle method.
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