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Monitoring of instrumentation of the 50-year old Mud Mountain Dam indicated to the U.S. Army Corps of Engineers (Seattle District) that the core of the 120-meter high earth-rockfill dam possessed defects that could lead to a potential piping failure. Therefore, a concrete cutoff wall was constructed using hydrofraise slurry wall construction techniques to correct this problem. During construction of the slurry wall, severe slurry losses and cracking of the dam occurred. A sophisticated recompression grouting program was implemented to fill existing openings and recompress the distressed core material to prevent hydraulic fracturing by the head of slurry in the trench. Once the grouting program was finished, the cutoff wall was completed without incident to a new world record depth of 122.7 meters.
Slurry wall, earth-rockfill dam, cutoff, hydrofraise, grouting, concrete, seepage, piping, hydraulic fracturing, arching
Senior Associate, Woodward-Clyde Consultants, Denver, Colorado
Project Manager, Soletanche, Inc., Nanterre,
Design Engineer, U.S. Army Corps of Engineers, Seattle, Washington