Comparison of Success Ratio Calculated Limit Equilibrium Methods for Slope Stability Analyzes, Eurocode 7 and BS8006 Standards

Abstract

Within the scope of this study, the limit equilibrium methods and Eurocode 7 and BS 8006 standards, which are commonly used in slope stability analysis in our country, have been analysed on the cases which have been well studied in the literature. In order to carried out this comparison, the minimum factor of safety in which the slope is stable within three methods are reduced to a common base. The limit of 1.5 factor of safety accepted for TS 8853 standard is accepted as the limit value for traditional limit equilibrium methods. For Eurocode 7 and BS 8006 standards, this value is accepted as 1. The factor of safety calculated as the result of the analyses are divided by the value determined for each method, and the success rate is obtained, and these values ​​are compared. In addition to limit equilibrium methods, the factor of safety was also analysed by using finite element of shear strength reduction method. As a result of the comparisons, the success rate of traditional limit equilibrium methods in slope stability analysis gives more conservative results. For reinforced slopes and earthing walls, the BS 8006 standard gave more reliable results.