The Optimization of the Design of a Concrete Faced Rockfill Dam by the Application of Sand-Gravel Fill Zones
R. Haselsteiner& V. Balat
EnerjiSA Enerji Üretim A.S., Ankara, Turkey
Fichtner GmbH & Co. KG, Istanbul, Turkey
ABSTRACT: The design of the dam case study presented was changed during different design and planning stages, switching from an ordinary CFRD type to a quite sophisticated CFSGD with deep foundations. Whilst obtaining more detailed information on the geological conditions and the available fill materials the engineers responsible decided to use the alluvial deposits close to the dam area for the fill.
Originally, the dam was to have shallow foundations on the alluvial deposits present before clay layers with considerable thicknesses were encountered within the dam foundation. Therefore, the complete foundation concept had to be changed to a deep foundation in a highly permeable alluvium. Additionally, the left bank suffered from landslides during initial excavation works for the energy tunnel inlet so that the stability and design adjacent to the left bank has to be re-evaluated and re-designed. After agreeing on the detailed design principles and a general dam design material, investigations are ongoing and the optimization of the dam design is expectedto be completed before starting dam fill works in mid of 2011.
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