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GGU-UNDERPIN: Hydraulic heave safety using global safety factors

The hydraulic heave safety for each layer below the excavation base is determined via a comparison of the soil weights to the flow forces at the respective layer bases.

image-20241203-080328.png

  • image-20241203-080358.pngN = hydraulic heave safety of the layer N
  • G'i = buoyant self-weight of layer i
  • SN = flow force of layer N
  • layer 1 (i = 1) is the uppermost layer

The minimum value of all N is the hydraulic heave safety of the system.