ABSTRACT
Bishop’s simplified method was extended into 3-D system to analyze the stability of asymmetrical, hetrogeneous nailed slopes. Interaction between the axial nailing force and the reaction force on the potential failure surface was taken into account in this method. The introduction of the ‘two-directional’ moment equilibrium in two orthogonal directions, calculates the safety factor as well as the directions of sliding for a potential failure mass. Therefore, the error inherent in assuming a plane of symmetry is eliminated. It was also shown that the direction of the nailing force can be optimized by applying the direction of the nailing force to that of potential sliding obtained in the analysis.
