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These test methods apply to water-saturated porous materials containing virtually no air. Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods.
ASTM D Standard
NOTE 10—The test specimen may be consolidated prior to application of back pressure. Standard triaxial configuration with external data acquisition can be used for performing additional test such as CBR, Unconfined and CRS, Permeability.
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Experience has sometimes shown that hydraulic conductivities measured on small test specimens are not necessarily the same as largerscale values. The corrected diameter and actual length before the back pressure was removed are used to compute the volume of the test specimen prior to dismantling the cell.
ASTM D, Test equipment Controls
Neither hard clods nor individual particles of the material shall exceed 1? The effluent tailwater pressure shall not be decreased because air bubbles that were dissolved by the specimen water during backpressuring may come out of solution if the pressure is decreased.
Therefore, For overconsolidated consolidated soils: If no gradient is speci? Standard triaxial system with built-in digital data acquisition Standard triaxial System with built-in data acquisition is the ideal compact solution for performing standard triaxial tests such as effective and total stress. Based on the above, an initial void ratio of 0. Also measure and record any changes in height of the test specimen, if being monitored see Note Units other than second smeters metc.
For this to occur the axial strain should be less than about 0.
This is done for three reasons: A typical Standard triaxial system with analogue measurements includes: If the void ratio is changed, the hydraulic conductivity of the test specimen will likely change, see Appendix X2.
In addition, they are representative of the significant digits that should generally be retained. Also, the initial degree of saturation shall be estimated this information may be used later in the back-pressure stage. NOTE 14—The specimen may swell after removal of back pressure as a result of air coming out of solution.
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If deformations are measured, the deformation indicator shall be a dial indicator or cathetometer graduated to 0. In designing this type of hydraulic system, the zstm of the tailwater tube aout is made signi?
More than system configurations are available depending on type of test, sample size, pressure system. Relatively incompressible, saturated materials have B values that are somewhat less than 1.
Measure and record periodically the quantity of in? For this reason, distilled water is not usually recommended as a permeant liquid.
If boiling is used, care shall be taken not to evaporate an excessive amount of water, which can lead to a larger salt concentration in the permeant water than desired. Since the change in velocity head is assumed to be zero and the change in capillary head is included in the pressure head calculation given above Eq X1.
The pressure head is the height of a vertical column of static water that can be supported by the static pressure p at a given point.
No further reproductions authorized. However, the following items listed may be used: Establish allowable working pressures and make sure they are not exceeded.