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

Abstract: 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: Shafts | Porous media | Leakage | Rock masses | Pore pressure | Hydraulics | Jacking

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