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Remedial Measures for Spillway Stability Problem on the Colorado Front Range
Stability problems with dam spillways on existing landslides and appropriate mitigation measures to remedy them are ongoing concerns for geotechnical engineers. The first successful application of drilled piers as stabilizing structures under the spillway was at the Trinity Dam in Sicily, Italy. Based on the available literature the first application of drilled piers to stabilize a spillway chute in the U.S. was at the Ralston Dam in Colorado. Ralston Dam, which is a 53.3-meter-high (175-foot) zoned fill dam located 24 km (15 miles) northwest of downtown Denver, was built in the late 1930s. The concrete spillway for the dam was built on the Pierre Shale Formation in the left abutment. Since reservoir operations began, mass movements have occurred downstream of the chute area. With modifications that include: 1) a stabilizing berm with a toe trench that improves the global stability; 2) seepage prevention and control measures that prevent the infiltration of water; and 3) the structural support of the replaced chute section with drilled piers and reinforced concrete the probability of future displacements or other problems have been reduced for the Ralston Dam Spillway. Over the last two years Ralston Dam spillway performed without any problems.
Remedial Measures for Spillway Stability Problem on the Colorado Front Range
Stability problems with dam spillways on existing landslides and appropriate mitigation measures to remedy them are ongoing concerns for geotechnical engineers. The first successful application of drilled piers as stabilizing structures under the spillway was at the Trinity Dam in Sicily, Italy. Based on the available literature the first application of drilled piers to stabilize a spillway chute in the U.S. was at the Ralston Dam in Colorado. Ralston Dam, which is a 53.3-meter-high (175-foot) zoned fill dam located 24 km (15 miles) northwest of downtown Denver, was built in the late 1930s. The concrete spillway for the dam was built on the Pierre Shale Formation in the left abutment. Since reservoir operations began, mass movements have occurred downstream of the chute area. With modifications that include: 1) a stabilizing berm with a toe trench that improves the global stability; 2) seepage prevention and control measures that prevent the infiltration of water; and 3) the structural support of the replaced chute section with drilled piers and reinforced concrete the probability of future displacements or other problems have been reduced for the Ralston Dam Spillway. Over the last two years Ralston Dam spillway performed without any problems.
Remedial Measures for Spillway Stability Problem on the Colorado Front Range
Inci, Gokhan (author) / Baures, Dale M. (author) / Miller, Michael J. (author)
Biennial Geotechnical Conference 2008 ; 2008 ; Denver, Colorado, United States
GEO-Velopment ; 38-52
2008-10-28
Conference paper
Electronic Resource
English
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