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Alternative approaches for analyses of a 100,000 m3 rock slide based on Barton–Bandis shear strength criterion

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A data set was derived for the Åknes rock slope, Norway, with the main focus on deriving input parameters for the Barton–Bandis shear strength criterion. Back-calculations of a 100,000 m3 rock slide were performed for evaluation of the data set. The limit equilibrium analysis showed that the joint roughness coefficient (JRC) has the greatest effect on the calculated safety factor of the slide. Probabilistic computations showed that the JRC stands out as the most important contributor to the total uncertainty over the whole set of variables and that the computed failure probability of the 1960 slide was very high, which may be interpreted that the input variables and the Barton–Bandis shear strength criterion are reasonable for the slide. JRC was measured on 0.25 m scale and on 1 m scale. The results from the two scales were different.

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The work presented here is part of ongoing projects funded by the Research Council of Norway through the Centre of Excellence–International Centre for Geohazards (ICG), the Geological Survey of Norway (NGU), Norwegian Geotechnical Institute (NGI), Norwegian University of Science and Technology (NTNU), National Fund for Natural Damage Assistance and Møre and Romsdal County, and the Aaknes/Tafjord project. The authors want to thank Nicole Ragvin (NTNU) for assistance in field investigations, data analysis and laboratory work and Dr Lars Harald Blikra for reviewing the paper.

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Correspondence to Vidar Kveldsvik.

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Kveldsvik, V., Nilsen, B., Einstein, H.H. et al. Alternative approaches for analyses of a 100,000 m3 rock slide based on Barton–Bandis shear strength criterion. Landslides 5, 161–176 (2008).

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