Chart-based slope stability assessment using the Generalized Hoek–Brown criterion

Abstract

We present new stability charts for the analysis of rock mass slopes satisfying the Generalized Hoek–Brown (GHB) criterion. Firstly, charts for calculating the factor of safety (FOS) of a slope for a specified slope angle β=45° are proposed. Secondly, a disturbance weighting factor fD is introduced to illustrate the effect of disturbance factor D upon the stability of rock slopes. Thirdly, a slope angle weighting factor fβ is proposed to show the influence of slope angle β on slope stability. Combined with stability charts based on β=45°, the weighting factors fD and fβ allow the calculation of the FOS of a slope assigned various slope angle under different blasting damage and stress relief conditions. The reliability of the proposed charts is tested against numerical solutions. The results show that FOS from the proposed charts exhibits only 3.1% average discrepancy from numerical solutions using 1680 sets of data. The proposed charts are simple and straightforward to use and can be adopted as useful tools for the preliminary rock slope stability analysis.