Rocky Mountain Project Seepage Cutoff in Solutioned Limestone

by A. H. Stukey, Harza Engineering Co, Chicago, United States,
G. Taylor, Harza Engineering Co, Chicago, United States,
K. L. Wong, Harza Engineering Co, Chicago, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


The right abutment of the main closure dam for the Rocky Mountain Project required extensive treatment of deeply weathered shale and solutioned limestone to assure control of seepage and potential piping. The selected treatment involved removal of the weakened rock using a large open cut trench excavation, foundation grouting, and a zoned embankment backfill in part of the excavated trench. The trench was 700 ft long and 250 ft deep. One million cubic yards of rock was excavated; approximately 350,000 cubic yards of backfill will be placed in the completed excavation. Most of the construction was accomplished in the period from July 1989 to November 1990 under a contract awarded by the principal owner, Oglethorpe Power Corporation, Tucker, Georgia.

Subject Headings: Trenches | Mountains | Seepage | Limestone | Backfills | Dam foundations | Hydro power | Earthfill dams | Rocky Mountains | Georgia | United States

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