Engineering geological evaluation of the Of Solaklı Hydropower Development Project NE Turkey

Doyuran, Vedat
Toprak, Vedat
Topal, Tamer
Koçyiğit, Ali
Rojay, Fuat Bora
Bozkurt, Erdin
The Of-Solakli Hydropower Development Project (HDP) is designed to generate 380 MW of electricity through the diversion of six streams into a headrace tunnel and maintaining a head difference of 1 000 m above the underground power station. The tunnel system is located within felsic and mafic magmatic rocks, and volcanogenic flysch. In this paper an engineering geological evaluation of the HDP is introduced. The field investigations included geological strip mapping, core drilling, and intense discontinuity surveying. A portion of the headrace tunnel was re-located due to adverse foundation conditions. The rock mass qualities of various lithological units were determined and the necessary support systems are described.