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|Construction of tremie concrete cutoff wall, Wolf Creek Dam, Kentucky
|Holland, Terence C.
Turner, Joseph R.
Diaphragm wall construction
Wolf Creek Dam
|Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-80-10.
Abstract: Significant leakage was occurring at a Corps of Engineers dam. The cause of the leakage was postulated to be flow through the dam's cutoff trench or through solution cavities beneath the dam or through both. The repair technique selected was to construct a concrete cutoff wall through the earth-fill portion of the dam into the rock foundation using a modification of the diaphragm wall technique often used in foundation construction. Concrete was placed by tremie to construct the individual elements making up the wall. The construction methods, equipment, and materials are described in this report. The report emphasizes the effort to determine the cause of isolated area of heterogeneities such as honeycomb and laitance which were found in the completed wall. The apparent cause was a combination of segregation occurring during the fall of the concrete through the tremie, the small diameter of the wall elements, the smooth walls of the casings being used for the elements, and the rapid rate of concrete placement. It is believed that these last three factors inhibited concrete remixing within the wall elements leading to the heterogeneities noted. Since the problems were confined to cased elements, no detrimental effects on the cutoff wall are anticipated. Overall, the procedure has proved to be an effective cure for the leakage at the structure. The problems identified also have bearing on other types of deep, confined tremie concrete placements such as cast-in-place piles or piers or the filling of precast concrete elements.
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