ASTM D6391-06
(Test Method)Standard Test Method for Field Measurement of Hydraulic Conductivity Limits of Porous Materials Using Two Stages of Infiltration from a Borehole
Standard Test Method for Field Measurement of Hydraulic Conductivity Limits of Porous Materials Using Two Stages of Infiltration from a Borehole
SCOPE
1.1 This test method covers field measurement of limiting values for vertical and horizontal hydraulic conductivities (also referred to as coefficients of permeability) of porous materials using the two-stage, cased borehole technique. These limiting hydraulic conductivity values are the maximum possible for the vertical direction and minimum possible for the horizontal direction. Determination of actual hydraulic conductivity values requires further analysis by qualified personnel.
1.2 This test method may be utilized for compacted fills or natural deposits, above or below the water table, that have a mean hydraulic conductivity less than or equal to 110-5 m/s (110-3 cm/s).
1.3 Hydraulic conductivity greater than 110 -5 m/s may be determined by ordinary borehole tests, for example, U.S. Bureau of Reclamation 7310 (); however, the resulting value is an apparent conductivity.
1.4 For this test method, a distinction must be made between "saturated" (Ks) and "field-saturated" (Kfs) hydraulic conductivity. True saturated conditions seldom occur in the vadose zone except where impermeable layers result in the presence of perched water tables. During infiltration events or in the event of a leak from a lined pond, a "field-saturated" condition develops. True saturation does not occur due to entrapped air (). The entrapped air prevents water from moving in air-filled pores that, in turn, may reduce the hydraulic conductivity measured in the field by as much as a factor of two compared with conditions when trapped air is not present (). This test method simulates the "field-saturated" condition.
1.5 Experience with this test method has been predominantly in materials having a degree of saturation of 70 % or more, and where the stratification or plane of compaction is relatively horizontal. Its use in other situations should be considered experimental.
1.6 As in the case of all tests for hydraulic conductivity, the results of this test pertain only to the volume of soil permeated. Extending the results to the surrounding area requires both multiple tests and the judgment of qualified personnel. The number of tests required depends on among other things: the size of the area, the uniformity of the material in that area, and the variation in data from multiple tests.
1.7 The values stated in SI units are to be regarded as the standard unless other units specifically are given. By tradition in U.S. practice, hydraulic conductivity is reported in cm/s although the common SI units for hydraulic conductivity are m/s.
1.8 All observed and calculated values shall conform to the guide for significant digits and rounding established in Practice D 6026.
1.8.1 The procedures in this standard that are used to specify how data are collected, recorded, and calculated are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The procedures do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the objectives of the user. Increasing or reducing the significant digits of reported data to be commensurate with these considerations is common practice. Consideration of the significant digits to be used in analysis methods for engineering design is beyond the scope of this standard.
1.9 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This test method does not purport to address environmental protection problems, as well.
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Designation: D6391 – 06
Standard Test Method for
Field Measurement of Hydraulic Conductivity Limits of
Porous Materials Using Two Stages of Infiltration from a
1
Borehole
This standard is issued under the fixed designation D6391; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.6 As in the case of all tests for hydraulic conductivity, the
results of this test pertain only to the volume of soil permeated.
1.1 This test method covers field measurement of limiting
Extending the results to the surrounding area requires both
valuesforverticalandhorizontalhydraulicconductivities(also
multiple tests and the judgment of qualified personnel. The
referred to as coeffıcients of permeability) of porous materials
number of tests required depends on among other things: the
using the two-stage, cased borehole technique. These limiting
size of the area, the uniformity of the material in that area, and
hydraulic conductivity values are the maximum possible for
the variation in data from multiple tests.
the vertical direction and minimum possible for the horizontal
1.7 The values stated in SI units are to be regarded as the
direction. Determination of actual hydraulic conductivity val-
standard unless other units specifically are given. By tradition
ues requires further analysis by qualified personnel.
in U.S. practice, hydraulic conductivity is reported in cm/s
1.2 This test method may be utilized for compacted fills or
although the common SI units for hydraulic conductivity are
natural deposits, above or below the water table, that have a
–5
m/s.
mean hydraulic conductivity less than or equal to 1310 m/s
–3
1.8 All observed and calculated values shall conform to the
(1310 cm/s).
–5
guide for significant digits and rounding established in Practice
1.3 Hydraulic conductivity greater than 1310 m/s may be
D6026.
determined by ordinary borehole tests, for example, U.S.
2 1.8.1 Theproceduresinthisstandardthatareusedtospecify
Bureau of Reclamation 7310 (1) ; however, the resulting value
how data are collected, recorded, and calculated are regarded
is an apparent conductivity.
as the industry standard. In addition, they are representative of
1.4 Forthistestmethod,adistinctionmustbemadebetween
the significant digits that should generally be retained. The
“saturated” (K ) and “field-saturated” (K ) hydraulic conduc-
s fs
procedures do not consider material variation, purpose for
tivity. True saturated conditions seldom occur in the vadose
obtaining the data, special purpose studies, or any consider-
zoneexceptwhereimpermeablelayersresultinthepresenceof
ations for the objectives of the user. Increasing or reducing the
perched water tables. During infiltration events or in the event
significant digits of reported data to be commensurate with
of a leak from a lined pond, a “field-saturated” condition
these considerations is common practice. Consideration of the
develops. True saturation does not occur due to entrapped air
significantdigitstobeusedinanalysismethodsforengineering
(2). The entrapped air prevents water from moving in air-filled
design is beyond the scope of this standard.
pores that, in turn, may reduce the hydraulic conductivity
1.9 This standard does not purport to address the safety
measured in the field by as much as a factor of two compared
concerns, if any, associated with its use. It is the responsibility
with conditions when trapped air is not present (3). This test
of the user of this standard to establish appropriate safety and
method simulates the “field-saturated” condition.
health practices and determine the applicability of regulatory
1.5 Experience with this test method has been predomi-
limitations prior to use. This test method does not purport to
nantly in materials having a degree of saturation of 70 % or
address environmental protection problems, as well.
more, and where the stratification or plane of compaction is
relatively horizontal. Its use in other situations should be
2. Referenced Documents
considered experimental.
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2.1 ASTM Standards:
D653 Terminology Relating to Soil, Rock, and Contained
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Fluids
Rock and is the direct responsibility of Subcommittee D18.04 on Hydrologic
Properties and Hydraulic Barriers.
Current edition approved Feb. 1, 2006. Published March 2006. Originally
3
approved in 1999. Last previous edition approved in 2004 as D6391 - 99(2004).
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/D6391-06.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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The b
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