Sammendrag
Calculation of rock slope stability may be based on several alternative approaches, with empirical, limit equilibrium, numerical and probabilistic as the most common. Eurocode 7, which over the last 10 years has become the basic standard for geotechnical design in most European countries, allows for using all these principles provided that the guidelines described in the Eurocode are followed. In Norway, Eurocode 7 replaced the National Standard NS3480 in 2010 as the only standard to be used for geotechnical design. The introduction of Eurocode 7 represented some important changes of the way slope stability analysis and calculation is to be carried out. Most importantly, the previously very commonly used principle of calculating one single Factor of Safety (FS) is no longer to be used, and in Norway it will be in conflict with the national law for Planning and Construction to use this principle. The “new” approach to be used is the so-called Partial Factor (PF) principle, involving partial factors to be placed on all acting forces/loads (i.e. gravitational forces, water pressure, seismic forces) and on material strength (i.e. cohesion, friction angle and support elements). The values to be used for the various factors are defined in the Eurocode system. However, several dilemmas and questions arise when using the partial factors for rock slopes. In this contribution the basic differences between the traditional FS-method, which is still the most commonly used for limit equilibrium analysis outside Europe, and the PF-principle will be discussed, as well as some important aspects of defining partial factors, particularly connected to geological parameters.
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