Rock Engineering at Cat Arm Hydroelectric Developmentby Richard Humphries, Golder Associates, Atlanta, GA, USA,
Evert Hoek, Golder Associates, Atlanta, GA, USA,
Abstract: Cat Arm Hydroelectric Development in Newfoundland, Canada, develops 129 MW from 384 m of head. The project was constructed between 1981 and 1984 and comprises 5 large dams, 5 small dams, a surface powerhouse, 3 tunnels and major open cut rock excavations for the roads, spillway, powerhouse and tunnel portals. The paper describes the geotechnical design and construction of the rock excavations for the powerhouse, the spillway, the diversion tunnel, the main power tunnel and the low pressure tunnel. Details of the rock support design, the design of the steel lining at the downstream end of the power tunnel, the excavation techniques and applied contractural philosophy are given.
Subject Headings: Tunnels | Power plants | Rocks | Hydro power | Excavation | Linings | Earthfill dams | Spillways | North America | Canada
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