1、Designation:D7931/D7931M21aStandard Guide forSpecifying Drainage Geocomposites1This standard is issued under the fixed designation D7931/D7931M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in par
2、entheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide presents a guideline specifying a drainagegeocomposite product;it specifically provides recommenda-tions to determine the allowable flow rate
3、 of a candidatedrainage geocomposite.The resulting value is then comparedto a required(or design)flow rate for a product-specific andsite-specific factor of safety.1.2 This guide is intended to aid designers,purchasers,installers,contractors,owners,operators,and agencies inestablishing minimum guide
4、lines for drainage geocompositematerials.This guide is not to be used for manufacturersquality control purposes,nor is it a construction qualityassurance specification.1.3 This guide does not address the required(or design)flow rate value,nor the subsequent factor of safety values,which are typicall
5、y design specific.1.4 The procedures recommended in this guide use ASTMtest methods.1.5 This guide is applicable to all types of drainage geo-composites regardless of their core configuration or geotextiletype.It can also be used to evaluate thick,nonwoven geotex-tiles that provide drainage.1.6 The
6、values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.
7、1.7 This guide offers an organized collection of informationor a series of options and does not recommend a specific courseof action.This guide cannot replace education or experienceand should be used in conjunction with professional judgment.Not all aspects of this guide may be applicable in all ci
8、rcum-stances.This guide is not intended to represent or replace thestandard of care by which the adequacy of a given professionalservice must be judged,nor should this guide be appliedwithout consideration of a projects many unique aspects.Theword standard in the title of this guide means only that
9、theguide has been approved through the ASTM Internationalconsensus process.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices a
10、nd deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-
11、mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1987 Test Method for Biological Clogging of Geotextile orSoil/Geotextile FiltersD2990 Test Methods for Tensile,Compressive,and FlexuralCreep and Creep-Rupture of Plas
12、ticsD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4716/D4716M Test Method for Determining the(In-plane)Flow Rate per Unit Width and Hydraulic Transmissivityof a Geosynthetic Using a Constant HeadD4873/D4873M Guide
13、 for Identification,Storage,and Han-dling of Geosynthetic Rolls and SamplesD5321/D5321M Test Method for Determining the ShearStrengthofSoil-GeosyntheticandGeosynthetic-Geosynthetic Interfaces by Direct ShearD5322 Practice for Laboratory Immersion Procedures forEvaluating the Chemical Resistance of G
14、eosynthetics toLiquidsD6243/D6243M Test Method for Determining the Internaland Interface Shear Strength of Geosynthetic Clay Liner1This guide is under the jurisdiction ofASTM Committee D35 on Geosyntheticsand is the direct responsibility of Subcommittee D35.03 on Permeability andFiltration.Current e
15、dition approved Nov.1,2021.Published November 2021.Originallyapproved in 2017.Last previous edition approved in 2021 as D7931 21.DOI:10.1520/D7931_D7931M-21A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMS
16、tandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(