ASTM D6519-2008 用液压操作的固定活塞采样器进行土壤取样的标准实施规程

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【英文标准名称】:StandardPracticeforSamplingofSoilUsingtheHydraulicallyOperatedStationaryPistonSampler
【原文标准名称】:用液压操作的固定活塞采样器进行土壤取样的标准实施规程
【标准号】:ASTMD6519-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:hydraulicallyactivated;stationarypiston;thin-walledtube;Thin-walledtubulartestspecimen;Hydraulicstationarypistonsampler;Soilsampling;Stationarypistonsampler
【摘要】:Hydraulicallyactivatedstationarypistonsamplersareusedtogathersoilsamplesforlaboratoryorfieldtestingandanalysisforgeologicinvestigations,soilchemicalcompositionstudies,andwaterqualityinvestigations.Thesamplerissometimesusedwhenattemptstorecoverunstablesoilswiththin-walledtubes,PracticeD1587,areunsuccessful.Examplesofafewtypesofinvestigationsinwhichhydraulicstationarypistonsamplersmaybeusedincludebuildingsitefoundationstudiescontainingsoftsediments,highwayanddamfoundationinvestigationswheresoftersoilformationneedevaluation,wetlandcrossingsutilizingfloatingstructures,andhazardouswastesiteinvestigations.Hydraulicallyactivatedstationarypistonsamplersprovidespecimensnecessarytodeterminethephysicalandchemicalcompositionofsoilsand,incertaincircumstances,containedporefluids(seeGuideD6169).Hydraulicallyactivatedstationarypistonsamplerscanproviderelativelyintactsoilsamplesofsoftorlooseformationmaterialsfortestingtodetermineaccurateinformationonthephysicalcharacteristicsofthatsoil.Samplesofsoftformationmaterialscanbetestedtodeterminenumeroussoilcharacteristicssuchas;soilstratigraphy,particlesize,moisturecontent,permeability,sheerstrength,compressibility,andsoforth.Thechemicalcompositionofsoftformationsoilscanalsobedeterminedfromthesampleifprovisionsaremadetoensurethatclean,decontaminatedtoolsareusedinthesamplegatheringprocedure.Field-extrudedsamplescanbefield-screenedorlaboratory-analyzedtodeterminethechemicalcompositionofsoilandcontainedporefluids.Usingsealedorprotectedsamplingtools,casedboreholes,andproperadvancementtechniquescanhelpintheacquisitionofgoodrepresentativesamples.Ageneralknowledgeofsubsurfaceconditionsatthesiteisbeneficial.Theuseofthispracticemaynotbethecorrectmethodforinvestigationsofsofterformationsinallcases.Aswithallsamplingmethods,subsurfaceconditionsaffecttheperformanceofthesamplegatheringequipmentandmethodsused.Forexample,researchindicatesthatcleansandsmayundergovolumechangesinthesamplingprocess,duetodrainage.Thehydraulicallyactivatedstationarypistonsamplerisgenerallynoteffectiveforcohesiveformationswithunconfined,undrainedshearstrengthinexcessof2.0tonspersquarefoot,coarsesands,compactgravellytillscontainingbouldersandcobbles,compactedgravel,cementedsoil,orsolidrock.Theseformationsmaydamagethesampleorcauserefusaltopenetration.Asmallpercentageofgravelorgravelcuttingsinthebaseoftheboreholecancausethetubetobendanddeform,resultinginsampledisturbance.Certaincohesivesoils,dependingontheirwatercontent,cancreatefrictiononthethin-walledtubewhichcanexceedthehydraulicdeliveryforce.Somerockformationscanweatherintosoftorloosedepositswherethehydraulicallyactivatedstationarypistonsamplermaybefunctional.Theabsenceofgroundwatercanaffecttheperformanceofthissamplingtool.Aswithallsamplingandboreholeadvancementmethods,precautionsmustbetakentopreventcross-contaminationofaquifersthroughmigrationofcontaminatesupordowntheborehole.RefertoGuideD6286onselectingdrillingmethodsforenvironmentalsitecharacterizationforadditionalinformationaboutworkathazardouswastesites.1.1Thispracticecoversaprocedureforsamplingofcohesive,organic,orfine-grainedsoils,orcombinationthereof,usingathin-walledmetaltubethatisinsertedintothesoilformationbymeansofahydraulicallyoperatedpiston.Itisusedtocollectrelativelyintactsoilsamplessuitableforlaboratoryteststodeterminestructuralandchemicalpropertiesforgeotechnicalanden......
【中国标准分类号】:P13
【国际标准分类号】:13_080_01
【页数】:7P.;A4
【正文语种】:英语