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GEO5

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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 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 reserve). 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