Abstract
Three-dimensional stability analysis was done to evaluate the safety factor and slip surface of a modeled cut slope which is assumed from a practical case. The methods of calculation used here are Fellenius method and the elasto-plastic FEM. The safety factor calculated from the elasto-plastic FEM in the case of the associated flow rule (ψ=φ) coincides with the result from Fellenius method. However, it should be noted that the deformation of sliding mass is impractical because of excessive dilatancy on the slip surface developed by the assumption of ψ=φ.
The results predicted from FEM in which the soil parameters of the slope and slip surface coincide, are different from the failure mechanism assumed in Fellenius method and the observed failure surface. In order to investigate the actual phenomena of the slope failure it may be effective to make use of FEM in addition to the conventional method.
