ASTM D6918-09
(Test Method)Standard Test Method for Testing Vertical Strip Drains in the Crimped Condition
Standard Test Method for Testing Vertical Strip Drains in the Crimped Condition
SIGNIFICANCE AND USE
This test method is considered satisfactory for the acceptance of commercial shipments of vertical strip drains.
In case of dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is any statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that as homogenous as possible, and that are from a lot of material of the type in question. The test specimens should be randomly assigned in numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-test for unpaired data and an acceptable probability level chosen by the two parties before the start of testing. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in light of the known bias.
Vertical strip drains are installed in areas where it is desired to increase the rate of soil consolidation. It has been shown that as the soil around the vertical strip drain consolidates, a crimp may form in the vertical strip drain due to the movement of the drain in the area of soil consolidation.
This test method can be used to evaluate if there is any reduction in flow rate of water through the drain due to the crimping, and what effect, if any, this crimping may have on the rate of consolidation of the soil.
SCOPE
1.1 This test method is a performance test that measures the effect crimping has on the ability of vertical strip drains to transmit water parallel to the plane of the drain.
1.2 This test method is applicable to all vertical strip drains.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of 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.
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Designation: D6918 − 09
StandardTest Method for
1
Testing Vertical Strip Drains in the Crimped Condition
This standard is issued under the fixed designation D6918; 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 4.1.1 A vertical strip drain is sealed in a waterproof mem-
brane to prevent any water from escaping out through the
1.1 This test method is a performance test that measures the
geotextile during the test.
effect crimping has on the ability of vertical strip drains to
4.1.2 The sealed vertical strip drain is placed in the appro-
transmit water parallel to the plane of the drain.
priate crimping device and water is allowed to pass through it
1.2 This test method is applicable to all vertical strip drains.
under a constant head of water.
1.3 The values stated in SI units are to be regarded as 4.1.3 Acrimp is placed on the specimen, and water allowed
to pass through it under a constant head in the crimped
standard. No other units of measurement are included in this
standard. condition.
4.1.4 The flow rate of water along the plane of the un-
1.4 This standard does not purport to address all of the
crimped vertical strip drain is compared to the flow rate in the
safety concerns, if any, associated with its use. It is the
crimped condition.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This test method is considered satisfactory for the
acceptance of commercial shipments of vertical strip drains.
2. Referenced Documents
5.1.1 In case of dispute arising from differences in reported
2
2.1 ASTM Standards:
test results when using this test method for acceptance testing
D4354 Practice for Sampling of Geosynthetics for Testing
of commercial shipments, the purchaser and the supplier
D4439 Terminology for Geosynthetics
should conduct comparative tests to determine if there is any
statistical bias between their laboratories. Competent statistical
3. Terminology
assistance is recommended for the investigation of bias. As a
3.1 Definitions: minimum, the two parties should take a group of test speci-
mens that as homogenous as possible, and that are from a lot of
3.1.1 For general geosynthetics terms used in this standard,
refer to Terminology D4439. material of the type in question. The test specimens should be
randomly assigned in numbers to each laboratory for testing.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 vertical strip drain, n—a geocomposite consisting of a The average results from the two laboratories should be
compared using Student’s t-test for unpaired data and an
geotextile cover and drainage core installed vertically into soil
to provide drainage for accelerated consolidation of soils. acceptable probability level chosen by the two parties before
the start of testing. If a bias is found, either its cause must be
4. Summary of Test Method
found and corrected, or the purchaser and the supplier must
agree to interpret future test results in light of the known bias.
4.1 This test method presents two methods for determining
the effect of a crimp forming in the vertical strip drain due the 5.2 Vertical strip drains are installed in areas where it is
consolidation of soils around it in the field. desired to increase the rate of soil consolidation. It has been
shown that as the soil around the vertical strip drain
consolidates, a crimp may form in the vertical strip drain due
1
to the movement of the drain in the area of soil consolidation.
This test method is under the jurisdiction of ASTM Committee D35 on
Geosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-
5.3 This test method can be used to evaluate if there is any
ability and Filtration.
reduction in flow rate of water through the drain due to the
Current edition approved Nov. 1, 2009. Published January 2010. Originally
approved in 2003. Last previous edition approved in 2007 as D6918–03(2007).
crimping, and what effect, if any, this crimping may have on
DOI: 10.1520/D6918-09.
the rate of consolidation of the soil.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6. Apparatus
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.1 Method A:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6918–03 (Reapproved 2007) Designation:D6918–09
Standard Test Method for
1
Testing Vertical Strip Drains in the Crimped Condition
This standard is issued under the fixed designation D6918; 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
1.1 This test method is a performance test, whichtest that measures the effect crimping,crimping has on the ability of vertical
strip drains to transmit water parallel to the plane of the drain.
1.2 This test method is applicable to all vertical strip drains.
1.3The values stated in SI units are to be regarded as the standard.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D4354 Practice for Sampling of Geosynthetics for Testing Practice for Sampling of Geosynthetics for Testing
D4439 Terminology for Geosynthetics
3. Terminology
3.1 Definitions:
3.1.1geocomposite, n—a product composed of two or more materials, at least one of which is a geosynthetic.
3.1.2geosynthetics, n—aplanarproductmanufacturedfrompolymericmaterialsusedwithsoil,rock,earth,orothergeotechnical
engineering related material as an integral part of a man-made project, structure, or system.
3.1.3geotextile, n—a permeable geosynthetic comprised solely of textiles.
3.1.3.1Discussion—Geotextiles perform several functions in geotechnical engineering applications, including: separation,
filtration, drainage, reinforcement, and protection.
3.1.4
3.1.1 For general geosynthetics terms used in this standard, refer to Terminology D4439.
3.2 Definitions: Definitions of Terms Specific to This Standard:
3.2.1 vertical strip drain, n—a geocomposite consisting of a geotextile cover and drainage core installed vertically into soil to
provide drainage for accelerated consolidation of soils.
4. Summary of Test Method
4.1 This test method describes procedures presents two methods for determining the effect of a crimp forming in the vertical
strip drain due the consolidation of soils around it in the field.
4.1.1 Avertical strip drain is sealed in a cover of heat shrink plastic waterproof membrane to prevent any water from escaping
out through the geotextile during the test.
4.1.2 The sealed vertical strip drain is placed in the appropriate crimping device (See Fig. 1) and water is allowed to pass
through it under a constant head of water.
4.1.3A90°4.1.3 A crimp is placed on the specimen, and water allowed to pass through it under a constant head in the crimped
condition.
4.1.4 The flow rate of water along the plane of the uncrimped vertical strip drain is compared to the flow rate in the crimped
condition.
1
This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.03 on Permeability and
Filtration.
Current edition approved JuneNov. 1, 2007.2009. Published July 2007.January 2010. Originally approved in 2003. Last previous edition approved in 20032007 as
D6918–03(2007). DOI: 10.1520/D6918-03R07.10.1520/D6918-09.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D6918–09
5. Significance and Use
5.1 This test method is considered satisfactory for the acceptance of commercial shipments of vertical strip drains.
5.1.1 In case of dispute arising from differences in reported test results when using this test method for acceptance testing of
commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is any statistical bias
between their laboratories. Competent statistical assistance is recommended for the investigation of bias.As a minimum, the two
part
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