Koman Concrete Face Rockfill Dam Updating the Static and Seismic Evaluations

The static and seismic safety evaluation of the 115 m high Koman concrete face rockfill dam, located at the Drin river in Albania has been checked according to the current state-of-practice for the seismic safety evaluation of large embankment dams. For the dynamic analyses with the equivalent linear method a two-dimensional model of the highest dam section was used. The static analysis was carried out by a Mohr-Coulomb elasto-plastic material model of the rockfill. The safety of the dam was checked for the safety evaluation earthquake (SEE) with a peak ground acceleration of the horizontal component of 0.45 g. Spectrum-compatible artificially generated accelerograms were used determined based on a site-specific seismic hazard analysis. The peak absolute horizontal crest acceleration due to the SEE excitation is about 0.78 g for average material properties, and about 1.16 g for the most unfavorable material properties. The maximum crest settlement resulting from the sliding displacements plus an additional settlement due to the vibration-induced densification of the dam body are calculated as 0.98 m, under the most unfavorable conditions