ASTM D6391-99(2004)
(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 1x10-5 m/s (1x10-3 cm/s).
1.3 Hydraulic conductivity greater than 1x10-5 m/s may be determined by ordinary borehole tests, for example, U.S. Bureau of Reclamation 7310 (1); 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 (2). 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 (3). 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 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: D 6391 – 99 (Reapproved 2004)
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 D 6391; 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 (e) 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 This standard does not purport to address the safety
(1310 cm/s).
–5
concerns, if any, associated with its use. It is the responsibility
1.3 Hydraulic conductivity greater than 1310 m/s may be
of the user of this standard to establish appropriate safety and
determined by ordinary borehole tests, for example, U.S.
2 health practices and determine the applicability of regulatory
Bureau of Reclamation 7310 (1) ; however, the resulting value
limitations prior to use. This test method does not purport to
is an apparent conductivity.
address environmental protection problems, as well.
1.4 Forthistestmethod,adistinctionmustbemadebetween
“saturated” (K ) and “field-saturated” (K ) hydraulic conduc-
s fs
2. Referenced Documents
tivity. True saturated conditions seldom occur in the vadose
3
2.1 ASTM Standards:
zoneexceptwhereimpermeablelayersresultinthepresenceof
D 653 Terminology Relating to Soil, Rock, and Contained
perched water tables. During infiltration events or in the event
Fluids
of a leak from a lined pond, a “field-saturated” condition
D 1452 Practice for Soil Investigation and Sampling by
develops. True saturation does not occur due to entrapped air
Auger Borings
(2). The entrapped air prevents water from moving in air-filled
D 1587 Practice for Thin-Walled Tube Sampling of Soils
pores that, in turn, may reduce the hydraulic conductivity
for Geotechnical Purposes
measured in the field by as much as a factor of two compared
D 2937 Test Method for Density of Soil in Place by the
with conditions when trapped air is not present (3). This test
Drive-Cylinder Method
method simulates the “field-saturated” condition.
D 3740 Practice for Minimum Requirements for Agencies
1.5 Experience with this test method has been predomi-
Engaged in the Testing and/or Inspection of Soil and Rock
nantly in materials having a degree of saturation of 70 % or
as Used in Engineering Design and Construction
more, and where the stratification or plane of compaction is
D 5084 Test Methods for Measurement of Hydraulic Con-
relatively horizontal. Its use in other situations should be
ductivity of Saturated Porous Materials Using a Flexible
considered experimental.
Wall Permeameter
D 5092 Practice for Design and Installation of Ground
Water Monitoring Wells in Aquifers
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.04 on Hydrologic
Properties and Hydraulic Barriers.
Current edition approved May 1, 2004. Published June 2004. Originally 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 1999. Last previous edition approved in 1999 as D 6391 - 99.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
The boldface numbers in parentheses refer to the list of references at the end of
Standards volume information, refer to the standard’s Document Summary page on
this standard.
the ASTM website.
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