Seepage Analysis and Control for Dams: Engineering and DesignDepartment of the Army, Corps of Engineers, Office of the Chief of Engineers, 1986 |
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aquifer Army Engineer District Army Engineer Waterways Available backfill bentonite berm borehole boundary clay cm/sec coefficient of permeability compacted computed concrete cutoff wall construction Darcy's law determined discharge downstream seepage berm downstream toe drainage drawdown earth dam effective embankment Engineer Waterways Experiment equation equipotential lines excavation factor of safety filter finite element method fissures flow lines fragment head loss horizontal drains hydraulic gradient impervious core installed Laplace's equation layer line of seepage located material P. O. Box penetration percent pervious foundation piezometers piping ratio relief reservoir River rock mass seepage analysis shown in figure slope slurry trench cutoff slurry wall soil soil-bentonite slurry trench spillway surface Technical Information Center test section thickness top stratum total head trench drain U. S. Army Engineer underseepage unit weight uplift pressures upstream blanket values velocity vertical Vicksburg Waterways Experiment Station zone
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8 ページ - Filters are to have a maximum particle size of 3 in (75-mm) and a maximum of 5% passing the no. 200 (0.075 mm) sieve with the plasticity index (PI) of the fines equal to zero. PI is determined on the material passing the no. 40 (0.425 mm) sieve in accordance with ASTM-D-4318.
17 ページ - Chu, TY, Davidson, DT, and Wickstrom, AE, "Permeability Test For Sands," Permeability of Soils, ASTM Special Technical Publication No. 163, American Society for Testing Materials, Philadelphia, PA, 1955. 158 61. Smith, TW, Cedergren, HR, and Reyner, CA, "Permeable Materials for Highway Drainage,
27 ページ - Prickett, TA, and Lonnquist, CG, "Selected Digital Computer Techniques for Groundwater Resource Evaluation," Bulletin 55, 1971, Illinois State Water Survey, Urbana, 111.
3-5 ページ - The formal definition of the permeability of a porous medium may, therefore, be stated as the volume of a fluid of unit viscosity passing through a unit cross section of the medium in unit time under the action of a unit pressure gradient.
25 ページ - Field Measurement of Permeability in Soil and Rock," In Situ Measurement of Soil Properties, American Society of Civil Engineers, New York, Vol 2, 1976, pp 3-36.
2-18 ページ - Void ratio e is the ratio of the volume of voids to the volume of solid particles in a given soil mass.
2-7 ページ - Discharge Velocity and Ground Water Velocity The discharge velocity is defined as the quantity of fluid that passes through a unit of total area of the porous medium in a unit time.
34 ページ - ABSTRACT Finite-element, mathematical models that solve LaPlace's and Richard's equations numerically were used to locate the phreatic surface within tailings pond embankments and to define the subsurface flow of water from the pond. Both must be known to design structurally and environmentally safe tailings dams. The permeability distribution within and beneath the embankment, the fluid potential values upgradient and...
2-11 ページ - Permeability has the dimensions of a velocity and is usually expressed in centimetres per second.
6 ページ - D15 size. 2. Proceed to step 4 if the base soil contains no gravel (material larger than No. 4 sieve).