Leakage from Pressure Tunnels and Shafts

by Tor L. Brekke, Univ of California, Berkeley, CA, USA,
Bruce D. Ripley, Univ of California, Berkeley, CA, USA,

Document Type: Proceeding Paper

Part of: Waterpower '85


Several issues related to leakage from unlined pressure tunnels and shafts are reviewed and discussed. They include confinement, or cover requirements relative to hydraulic jacking of the rock mass; leaching of dissolvable materials; and surface problems due to spring formation and instability of colluvium or other deposits in adjacent valleysides.

Subject Headings: Tunnels | Shafts | Rock masses | Porous media | Hydro power | Water leakage and water loss | Pore pressure | Hydraulic pressure

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