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2024-07-11

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Bearing capacity according to EN 1997-1 Annex D

In the ground failure design according to EN 1997-1 [1], the actions normal to the foundation base and the design values of the resistances are compared. The computational method according to [1] 6.5.2.2 is used. Annex D of the standard provides an informative example of the analytical determination of the ground failure resistance.

Determination of Bearing Resistance

The characteristic value of the bearing resistance can be determined for drained conditions according to [1] Appendix D, Expression (D.2):

R_{k} / A^{'} = (c^{'} \cdot N_{c} \cdot b_{c} \cdot s_{c} \cdot i_{c}) + (q^{'} \cdot N_{q} \cdot b_{q} \cdot s_{q} \cdot i_{q}) + (0, 5 \cdot γ^{'} \cdot B^{'} \cdot N_{γ} \cdot b_{γ} \cdot s_{γ} \cdot i_{γ})

Characteristic Value of Ground Failure Resistance According to EN 1997-1, Annex D (Consolidated)

In case of undrained conditions, the following formula is used:

R_{k} / A^{'} = (π + 2) \cdot c_{u} \cdot b_{c} \cdot s_{c} \cdot i_{c} + q

Characteristic Value of Ground Failure Resistance According to EN 1997-1, Annex D (Unconsolidated)

Design check

The design value of the ground failure action is compared to the design value of the ground failure resistance:

η = \frac{{V^{'}}_{d} / A^{'}}{{R^{'}}_{d} / A^{'}} \leq 1, 0

Design Criterion of Ground Failure

Info

The actions and resistances should be combined with the partial safety factors 𝛾 according to [1] A.3.

References

European Committee for Standardization (CEN). (2014). Eurocode 7: Geotechnical Design – Part 1: General Rules, EN 1997-1:2014-03. Berlin: Beuth Verlag GmbH.

Parent Chapter

Ground Failure