The Cheves Hydropower project is located on Rio Huaura, about 130 kilometers (80 miles) by air north of Lima, Peru. Construction on the project began in 2011 and is expected to be finalized in 2013. This plant will add 168 MW / 837 GWh to the interconnected Peruvian hydroelectric system once operational. The prevailing geology is comprised of hard, brittle granodiorite and hornfels and has an overburden of up to 1,500 meters (4,920 feet).
A high in situ stress component has lead to rock bursts in the caverns, the surrounding tunnels and the headrace tunnel. Gall Zeidler Consultants is providing expert consulting services to the contractor, including the assessment of areas with rock bursts. The geological conditions required both a support and a field classification system to identify the risk of rock bursts.
Rio Huaura, 250 kilometers (155 miles) north of Lima, Peru
2012 – 2015
Hydropower Plant with Powerhouse, Transformer Cavern and Headrace, Surge and Tailrace Tunnels
Powerhouse: 60 meters (197 feet); Transformer Cavern: 27.5 meters (90 feet); Headrace Tunnel: 9,882 meters (32,421 feet); Surge Tunnel: 702 meters (2,303 feet); Tailrace Tunnel: 3,250 meters (10,666 feet)
Width: 15.5 meters (50.8 feet)
Height: 32 meters (105 feet)
Width: 11.2 meters (36.7 feet)
Height: 14 meters (46 feet)
Granodiorite, Hornfels, Sandstone, Shale, Coal; Rock bursts in hard, brittle Granodiorite and Hornfels
Approximately US $ 145 Million
Constructora Cheves S.A.C. (a JV between Hochtief Construction AG, Empresa Constructora Tecsa S.A. and ICCGSA Ingenieros Civiles y Contratistas Generales S.A.)