Eurocodul 7: "Eurocode 7: Geotechnical design - Part 1: General rules", introduce conceptul valorilor caracteristice ale parametrilor geotehnici. Valoarea caracteristica, inteleasa ca o estimare a parametrului care influenteaza aparitia starii limita considerate, va trebui utilizata in orice tip de verificare geotehnica, fie ca este vorba despre SLU (stari limita ultime sau potentiala prezenta a unei suprafete de ruptura) sau SLE (stari limita de exercitiu si anume deformari de tip elastic sau de consolidare indiferent de starea de ruptura).

 

Singura metodologie subliniata de EC7 pentru definirea valorilor caracteristice este de natura statistica.

 

“If statistical methods are used, the characteristic value should be derived such that the calculated probability of a worse value governing the occurrence of the limit state under consideration is not greater than 5%.

NOTE In this respect, a cautious estimate of the mean value is a selection of the mean value of the limited set of geotechnical parameter values, with a confidence level of 95%; where local failure is concerned, a cautious estimate of the low value is a 5% fractile”.

 

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