Using the partial safety factor concept the following must be verified:
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S'k = characteristic flow force on the percolated soil mass
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γH = partial factor for the flow force in favourable or unfavourable subsoil in the
HYD (EC 7) limit state -
G'k = characteristic dead load of the buoyant percolated soil mass
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γg,stb = partial factor for stabilising permanent actions in the
HYD (EC 7) limit state -
Layer 1 (i = 1) is the uppermost layer
The so-called utilisation factor µ can also be calculated from this relationship.
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µN = utilisation factor of layer N
Utilisation factors ≤ 1.0 mean that sufficient safety is given.