Table 5 Classifications of slope stability and instability based on Ray and De Smedt (2009) and Teixeira et al. (2015)
Stability classification | Factor of safety | Slope stability class |
|---|---|---|
1 | Fs ≤ 0.75 | very unstable |
2 | 0.75 < Fs ≤ 1 | unstable |
3 | 1 < Fs ≤ 1.25 | quasi stable |
4 | 1.25 < Fs ≤ 1.5 | stable |
5 | Fs > 1.5 | very stable |