Journal
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
Volume 172, Issue 4, Pages 301-311Publisher
ICE PUBLISHING
DOI: 10.1680/jgeen.18.00057
Keywords
codes of practice & standards; geotechnical engineering; risk & probability analysis
Funding
- Swedish Research Council Formas (the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning)
- Swedish Transport Administration,Better Interaction in Geotechnics (BIG)
- Tyrens AB
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Lack of harmonisation between reliability-based design and the partial factor method in Eurocode 7 (EN 1997-1:2004) is preventing the widespread introduction of a risk-based concept in geotechnical design. This paper discusses how uncertainties are managed according to EN 1997-1:2004 and possible implications of not harmonising the current safety format with reliability-based design. One of several challenges highlighted is how EN 1997-1:2004 defines the characteristic value and design value. The characteristic value is therein defined based on a classical frequentist approach through a confidence interval. From a Bayesian point of view, the current definition does not treat the characteristic value as an uncertain variable. Consequently, the definitions of the characteristic value and design value in EN 1997-1:2004 feature weak connections between uncertainties in the geotechnical properties and the consequences of failure, as regulated by the target reliability index.
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