GGU-CANTILEVER: 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.

• η_N = hydraulic heave safety of the layer N

• G'_i = buoyant self-weight of layer i

• S_N = flow force of layer N

• layer 1 (i = 1) is the uppermost layer

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