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GGU-UNDERPIN: Utilisation factor (hydraulic heave) using partial safety factors

Using the partial safety factor concept the following must be verified:

image-20241203-080455.png

  • S'k = characteristic flow force on the percolated soil mass
  • γH = partial factor for the flow force in favourable or unfavourable subsoil in the
    HYD limit state
  • G'k = characteristic dead load of the buoyant percolated soil mass
  • γg,stb = partial factor for stabilising permanent actions in the HYD limit state
  • layer 1 (i = 1) is the uppermost layer

The so-called utilisation factor µ can also be calculated from this relationship.

image-20241203-080526.png

  • µN = utilisation factor of layer N

Utilisation factors ≤ 1.0 mean that sufficient safety is given.