Civil Design of Underground Hydro Power Projectsby Gösta Persson, VBB-SWECO Consulting Engineers, Architects & Economists, Stockholm, Sweden,
Abstract: Various reasons exist for the development of underground schemes. Limited space at dam sites in deep and narrow river valleys makes it favourable to separate the power house from the dam structure and the diversion arrangements. Headrace tunnels with pressures varying within wide limits are either unlined or lined with shotcrete, concrete or steel depending on rock conditions and the prevailing pressure. Tailrace tunnels are designed as unlined or lined with shotcrete or concrete depending on the existing rock conditions. Transformers and switchgear can be located in the same rock cavern as the machinery hall or they can be located in an extension of the machinery hall. A third layout implies two separate parallel caverns.
Subject Headings: Tunnels | Rocks | Hydro power | Power plants | Dams | Shotcrete | Construction equipment
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