1、Designation:D820418(Reapproved 2022)Standard Practice forBurial and Retrieval of Samples in a Test Pad to EvaluateInstallation Effects on Geosynthetic Clay Liners1This standard is issued under the fixed designation D8204;the number immediately following the designation indicates the year oforiginal
2、adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers standardized procedures for obtain-ing samples of geos
3、ynthetic clay liners(GCLs)from a test padfor use in assessment of the effects immediately after installa-tion caused only by the installation techniques.The assessmentmay include physical testing.This practice is applicable toGCLs only.1.2 This practice is limited to full-scale test pads,and doesnot
4、 address laboratory modeling of field conditions.Thispractice does not address which test method(s)to use forquantifying installation damage.1.3 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
5、establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principl
6、es for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft
7、-lbf/ft3(2,700 kN-m/m3)D1883 Test Method for California Bearing Ratio(CBR)ofLaboratory-Compacted SoilsD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD2487 Practice for Classification of Soils for EngineeringPurposes(Unified Soil Classification Syste
8、m)D4429 Test Method for CBR(California Bearing Ratio)ofSoils in Place(Withdrawn 2018)3D4439 Terminology for GeosyntheticsD5887/D5887M Test Method for Measurement of IndexFlux Through Saturated Geosynthetic Clay Liner Speci-mens Using a Flexible Wall PermeameterD5888 Guide for Storage and Handling of
9、 GeosyntheticClay LinersD5993 Test Method for Measuring Mass per Unit Area ofGeosynthetic Clay LinersD6072/D6072M Practice for Obtaining Samples of Geosyn-thetic Clay LinersD6102 Guide for Installation of Geosynthetic Clay LinersD6496/D6496M Test Method for Determining AverageBonding Peel Strength B
10、etween Top and Bottom Layersof Needle-Punched Geosynthetic Clay LinersD6768/D6768M Test Method for Tensile Strength of Geo-synthetic Clay LinersD6913/D6913M Test Methods for Particle-Size Distribution(Gradation)of Soils Using Sieve Analysis2.2 GRI Standard:4GRI Guide GS11 Standard Guide for Construc
11、ting Test Padsto Assess Protection Materials Intended to AvoidGeomembrane Puncture3.Terminology3.1 Definitions:3.1.1 geosynthetic clay liner(GCL),na manufacturedhydraulic barrier consisting of clay bonded to a layer or layersof geosynthetics.3.1.2 multi-component GCL,nGCL with an attached film,coati
12、ng,or membrane decreasing the hydraulic conductivity orprotecting the clay core,or both.3.1.3 sample,n(1)a portion of material that is taken fortesting or for record purposes;(2)a group of specimens used,1This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the dire
13、ct responsibility of Subcommittee D35.04 on GeosyntheticClay Liners.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 2018.Last previous edition approved in 2018 as D8204 18.DOI:10.1520/D8204-18R22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orco
14、ntact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Geosynthetic Institute,475 Kedron Ave
15、nue,Folsom,PA19033-1208,http:/www.geosynthetic-institute.org.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 i
16、n the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1or of observations made,which provide information that can beused for making statistical inferences about the population(s)from which the specimens are drawn.3.1.4 test pad,na distinct area of actual or simulatedfull-scale construction.3.2 For definitions of other geosynthetics terms used in thispractice,refer to T
