Structural design measures for a 93 m high concrete-faced rockfill dam (CFRD) to cope with difficult geological conditions / Planung und Errichtung eines 93 m hohen Steinschüttdamms unter schwierigen geologischen Bedingungen

The 93 m high concrete-faced rockfill dam (CFRD) is one of the main components of the Kavsak Bendi hydro-electric scheme located in the south-eastern part of Turkey. After re-assessing the geological conditions at the dam site, it was necessary to change the dam design from the roller compacted concrete (RCC) gravity dam originally planned to a CFRD. Due to the very poor geological conditions, the application of internationally established design criteria for a CFRD foundation in the case of Kavsak Bendi CFRD necessitates extensive improvement of the dam foundation zone. Special emphasis has been placed on the strict geometric boundary conditions for the revision of the dam design as the river diversion facilities and the power waterway have already been completely constructed. At the moment, the main dam excavation works will soon be completed and the treatment of the dam foundation zone is almost finished. This paper presents the status quo with respect to the design and application of measures which have been considered to overcome the challenging foundation conditions of the Kavsak Bendi CFRD.