Accession Number : AD0715727
Title : Seepage Characteristics of Explosively Produced Craters in Soil and Rock.
Descriptive Note : Technical rept.,
Corporate Author : ARMY ENGINEER NUCLEAR CRATERING GROUP LIVERMORE CALIF
Personal Author(s) : Sherman,Walter C. ; Banks,Don C.
Report Date : AUG 1970
Pagination or Media Count : 81
Abstract : The report contains a review of the permeability characteristics of soil and rock formations in both disturbed and undisturbed conditions which are likely to occur in the zones surrounding craters. The report presents methods of determining permeability and tabulates typical values of permeability in a variety of materials. Factors which affect the seepage characteristics of craters are discussed, and a few examples are presented to illustrate the influence of seepage on stability calculations. The data indicate that laminar-flow conditions will prevail in soil and rock formations, depending upon the size of the pore opening and hydraulic gradient. For a given pore opening, a critical gradient exists above which the flow is found to be turbulent; the technique of constructing flow nets for turbulent flow is illustrated in the report. The correct assessment of seepage conditions in the zones surrounding a crater will depend to a large extent upon the correct evaluation of boundary conditions, such as geological discontinuities and sources of seepage. (Author)
Descriptors : (*SOILS, PERMEABILITY), (*ROCK, PERMEABILITY), (*NUCLEAR EXPLOSIONS, CRATERING), LAMINAR FLOW, MATHEMATICAL PREDICTION, MATHEMATICAL MODELS, COMPOSITE MATERIALS, POROSITY, CORRELATION TECHNIQUES, STABILITY, DRAINAGE, TERRAIN
Subject Categories : Geology, Geochemistry and Mineralogy
Distribution Statement : APPROVED FOR PUBLIC RELEASE