LRFD - Slope Stability Analysis
Analysis according to LRFD 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 design situation.
The input loads are verified, whether they act favorably or unfavorably. The surcharge magnitude is then multiplied by the corresponding partial factor for the load (ES or LL, respectively).
Resistance reduction (Resistance factors):
The overall resistance on the slip surface is reduced by the ϕSS partial factor. When evaluating the safety, the following condition on the slip surface must be satisfied:
where: | ϕSS | - | resistance factor on stability |
Fpas | - | resisting (passive) forces acting on the slip surface | |
Fact | - | active forces acting on the slip surface |
Analysis based on LRFD - input of partial factors for stability analyses