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dc.contributorUnited States. Army. Corps of Engineers. Lower Mississippi Valley Division.-
dc.contributor.authorPerry, Edward B. (Edward Belk)-
dc.descriptionTechnical report-
dc.descriptionAbstract: Past performance of Grenada Dam indicates piping of embankment and foundation soils through joints of the collector pipe for the toe drainage system (prior to its replacement with an open paved ditch in 1961) occurred. Also, rainfall erosion tunnels developed on the downstream slope of the dam, primarily in the valley section between sta 105+00 and 145+00 , soon after completion of the main embankment in 1949 and continued to develop at a decreasing rate to the present. Based upon laboratory tests conducted on undisturbed soil samples and reservoir water samples obtained in 1973 and 1976, the embankment soil is nondispersive at the surface and dispersive below a depth of about 6 ft. Limited data obtained below the embankment indicate the foundation soil is dispersive at the surface and nondispersive to dispersive with depth. The Australian method of analysis, using the exchangeable sodium percentage of the soil, total ionic concentration of the reservoir (eroding) water, and predominate clay mineral of the soil, indicates both the embankment and foundation soils would be potentially susceptible to dispersive clay piping if Grenada Dam contained cracks or sandy lenses traversing the width of the dam where the reservoir water would have a path of rapid access across the dam. Since piping failure through the embankment or foundation has not occurred, either the dam is free from cracks or sandy lenses traversing the width of the dam, or if cracks are present, the soil is able to swell and seal the flow channels. Based upon the history of occurrence of rainfall erosion tunnels on the downstream slope of the dam, it is apparent that the embankment soil at the time of construction was dispersive from the surface (below the 12- in. layer of topsoil) throughout its depth. The downstream slope of Grenada Dam has low susceptibility to rainfall erosion at present due to an amelioration process that has taken place with time that has changed the upper portion of the embankment from a dispersive soil to a nondispersive soil.-
dc.publisherGeotechnical Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesTechnical report (U.S. Army Engineer Waterways Experiment Station) ; GL-79-14.-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectGrenada Dam, Mississippi-
dc.subjectClay soils-
dc.subjectDispersive clays-
dc.subjectRainfall erosion k-
dc.titleSusceptibility of dispersive clay at Grenada Dam, Mississippi to piping and rainfall erosion-
Appears in Collections:Technical Report

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