D-Geo Stability – Reliability Analyses
Standards such as the Eurocode 7 require the execution of a reliability analysis. Such an analysis takes into account the variation of strength and loading. With the Reliability module one can choose between the partial factors concept and a probabilistic analysis. Users may manually input the actual parameter
probability distributions, or simply use D-Geo Stability ’s defaults for an approximate analysis without additional input. Using the default values, three different design methods are available that require no additional input:
- Mean value analysis
Traditional calculation of the safety factor, using fixed mean values of the parameters.
- Design value analysis
Calculation of the safety factor, using fixed design values of the parameters. D-Geo Stability derives these unfavourable lower or upper limits from stochastic parameter distributions and partial factors.
- Probabilistic design
Calculation of the safety factor (mean value), a probability of failure and influence factors. The probabilistic FORM (First Order Reliability Method) method uses variations of stochastic parameters for strength parameters and pore pressure. The uncertainty in external water loading is also taken into account, using a Gumbell distribution.
The Reliability Analyses module can be applied in combination with all regular options of the Bishop model and the Uplift models.
D-Geo Stability comes as a standard module, which can be extended further with other modules to fit more advanced applications