LRFD - Slope Stability Analysis
introduces two types of design coefficients - coefficients modifying the load magnitude (Load factors) and coefficients reducing the soil resistance (Resistance factors).
These coefficients enter the analysis according to the selected.
The input loads are verified, whether they act favorably or unfavorably. The surcharge magnitude is then multiplied by the corresponding partial factor for load (ES or LL, respectively).
Resistance reduction (Resistance factors):
The overall resistance on slip surface is reduced by the ϕSS partial factor. When evaluating safety, the following condition on the slip surface must be satisfied:
resistance factor on stability
resisting (passive) forces acting on slip surface
active forces acting on slip surface
Analysis based on LRFD - input of partial factors for stability analyses