Abstract
Slope stability analysis is one of the classical problems in the geotechnical engineering, while it is still in research and development of optimization problem of a multimodal function. Especially, in a natural slope stability analysis, a function to solve a safety factor become the multimodal function due to its scale or complex stratal architecture. In this paper, a calculation method of safety factor by efficient search algorithm using noncircular slip surface based on force equilibrium referred by Spencer method. The proposed method was applied to several slope models with previously calculated safety factors for the verification. Consequently, the proposed method is efficient to compare its computational accuracy and speed.
