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【英文标准名称】:StandardTestMethodforHydraulicConductivityofEssentiallySaturatedPeat
【原文标准名称】:基本饱和泥炭水渗导性的标准试验方法
【标准号】:ASTMD4511-2000(2006)
【标准状态】:现行
【国别】:
【发布日期】:2000
【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】:D18.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:施工材料;试验;泥炭
【英文主题词】:constant-headpermeability;hydraulicconductivity;peat;permeability;rigid-wallpermeameter;saturatedpeat
【摘要】:Valuesofhydraulicconductivitydeterminedbythistestmethodmaybeusefulinmakingroughpreliminaryestimatesoftheinitialratesofdrainageandcompressionofpeatdepositswhentheonlyeffectivestressincreaseonthedepositisthatresultingfromamoderate,gradualloweringofthewatertable.Evenunderlight,sustainedloads,peatwillundergodramaticvolumechangesthatinfluence(decrease)thehydraulicconductivityofthedepositbyseveralordersofmagnitude.Thistestmethoddoesnotofferprovisionsforthedeterminationoftherelationshipbetweenhydraulicconductivityandthevoidratioscorrespondingtoincreasingstresslevels.Therefore,thistestmethodisnotsuitableforapplicationsinvolvinggradeincreases,suchasembankmentconstructionorplacementofaccessbermsalongsidedrainageditches.Undisturbedspecimensfromapparentlyhomogeneouspeatdepositsatthesamelocationoftenexhibitsignificantlydifferenthydraulicconductivitypropertiesduetovariationsinmaterialcompositionandsamplingprocedure.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoversthedeterminationofthehydraulicconductivity(permeability)ofessentiallysaturated,intactcylindricalspecimensofpeatwhenthehydraulicconductivityisgreaterthan110-7m/s(110-5cm/s).Duringthetest,thespecimensarecontainedinthecoreholder,orinright,regularcylindricalsectionscutfromthesamplingtubeinwhichtheywereoriginallyobtainedinthefield.1.2Hydraulicconductivityiscalculatedonthebasisofthemeasuredconstantflowratethroughthespecimenunderconstanthead.Forverification,flowratedeterminationsmaybemadeattwoormorevaluesofconstantheadwithcorrespondingcalculationsofhydraulicconductivity.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4AllobservedandcalculatedvaluesshallconformtotheguideforsignificantdigitsandroundingestablishedinPracticeD6026.1.4.1Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproceduresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuser''sobjectives,anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalysismethodsforengineeringdesign.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:D20
【国际标准分类号】:65_080
【页数】:5P.;A4
【正文语种】: