GGU-STABILITY: Safety factor definitions
In accordance with DIN 4084 (old), the program uses the safety definition after Fellenius:

For bearing capacity analysis according to DIN 4017, the safety factor is acquired from a comparison of the failure load Vb and the working strip footing load Vwork.:

Other comparisons are usual for different calculation procedures. For verification of the external stability of a soil nail wall, e.g., the nail forces are used in the safety definition.
Such safety definitions can also be created indirectly with GGU-STABILITY. If, for example, you would like to calculate the bearing capacity safety of a strip footing within a slope, enter the strip footing load as a permanent load and increase the actual load value by the required safety factor (e.g.
Procedure for partial safety factor concept
As described above for the global safety factor concept, the forces V and H are modified until the utilisation factor for the slope stability analysis is "1.0" This gives the ultimate bearing capacity Vb and from this the utilisation factor for bearing capacity analysis = V/Vb. Using the partial safety factor concept loads must be increased by the partial factors for actions and the partial factor for bearing capacity. The partial factors for the friction angle, cohesion and permanent actions are set to "1.0".
In certain systems the analysis method may lead to non-converging solutions.
It is safer to deactivate the "Bearing capacity" check box in the "Editor 1/Analysis options". Then define the V and H loads as permanent actions. Using the partial safety factor concept actions must be increased by the partial factors for actions and the partial factor for bearing capacity increased. When using the global safety factor concept the loads are increased by the required bearing capacity factor. A traditional slope stability analysis can then be performed.
If utilisation factors ≤ 1.0 are achieved sufficient bearing capacity is verified.