Verification According to the Theory of Limit States
When performing verification according to the theory of limit states the program reduces material parameters of rocks (angle of internal friction or tangent of the angle of internal friction, cohesion) using partial coefficients entered in the "Stability analysis" tab. Verification condition has the form:
where: | Tact | - | shear forces along the slip surface (active) |
Tres | - | passive forces along the slip surface | |
γs | - | reduction coefficient of the overall stability of construction (input in the "Stability analysis") |
When analyzing the polygonal slip surface the program compares the calculated value with the value corresponding to the fully stressed design (state of equilibrium with zero reserves). Verification condition has the form:
where: | SF | - | factor of safety calculated with the reduced material parameters |
SFs | - | coefficient of the overall stability of the structure |