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Evaluation of Flow Rate of 20-inch-Diameter Permeability Test System
Laboratory permeability tests on soils containing gravel that were performed using designation E- 14 in the Earth Manual (Permeability and Settlement of Soil Containing Gravel) showed what appeared to be inconsistent results when coefficients of hydraulic conductivity were determined at flow rates approaching the hydraulic conductivity limit of the test system. Although this behavior was noted before, the specific reasons for the inconsistency were not investigated or documented. The primary problem with the test data appears in the form of decreasing calculated coefficients of hydraulic conductivity as the hydraulic gradient is increased. Although this appears unreasonable, it occurs because the test system operates at a flow rate where a linear flow rate versus hydraulic head relationship does not exist because of the test equipment configuration. To illustrate this behavior, a brief evaluation of the flow rate of the test equipment was performed, and the results were compared with results from an actual permeability test. This information was useful in identifying inadequacies in the existing test apparatus, and it provides the basis for guidelines used to evaluate the results of permeability tests.
Evaluation of Flow Rate of 20-inch-Diameter Permeability Test System
Laboratory permeability tests on soils containing gravel that were performed using designation E- 14 in the Earth Manual (Permeability and Settlement of Soil Containing Gravel) showed what appeared to be inconsistent results when coefficients of hydraulic conductivity were determined at flow rates approaching the hydraulic conductivity limit of the test system. Although this behavior was noted before, the specific reasons for the inconsistency were not investigated or documented. The primary problem with the test data appears in the form of decreasing calculated coefficients of hydraulic conductivity as the hydraulic gradient is increased. Although this appears unreasonable, it occurs because the test system operates at a flow rate where a linear flow rate versus hydraulic head relationship does not exist because of the test equipment configuration. To illustrate this behavior, a brief evaluation of the flow rate of the test equipment was performed, and the results were compared with results from an actual permeability test. This information was useful in identifying inadequacies in the existing test apparatus, and it provides the basis for guidelines used to evaluate the results of permeability tests.
Evaluation of Flow Rate of 20-inch-Diameter Permeability Test System
T. E. Metcalf (author)
1986
22 pages
Report
No indication
English
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