ASTM D5912-1996(2004) 通过超阻尼井回应顶部的瞬息变化测定自由含水层液压导电率的分析程序的标准试验方法

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【英文标准名称】:StandardTestMethodfor(AnalyticalProcedure)DeterminingHydraulicConductivityofanUnconfinedAquiferbyOverdampedWellResponsetoInstantaneousChangeinHead(Slug)
【原文标准名称】:通过超阻尼井回应顶部的瞬息变化测定自由含水层液压导电率的分析程序的标准试验方法
【标准号】:ASTMD5912-1996(2004)
【标准状态】:现行
【国别】:
【发布日期】:1996
【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】:D18.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:含水土层;现场试验;地下水;极限;冲击试验;井;监控井;地下井;液压导电率;水平面;含水土层系统;透射率和反射率;自由含水层
【英文主题词】:aquifers;aquifertests;controlwells;groundwater;hydraulicconductivity;slugtest
【摘要】:1.1Thistestmethodcoversthedeterminationofhydraulicconductivityfromthemeasurementofinertialforcefree(overdamped)responseofawell-aquifersystemtoasuddenchangeinwaterlevelinawell.Inertialforcefreeresponseofthewaterlevelinawelltoasuddenchangeinwaterlevelischaracterizedbyrecoverytoinitialwaterlevelinanapproximateexponentialmannerwithnegligibleinertialeffects.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwiththefieldprocedureinTestMethodD4044forcollectionoftestdata.1.3LimitationsSlugtestsareconsideredtoprovideanestimateofhydraulicconductivity.Thedeterminationofstoragecoefficientisnotpossiblewiththistestmethod.Becausethevolumeofaquifermaterialtestedissmall,thevaluesobtainedarerepresentativeofmaterialsveryneartheopenportionofthecontrolwell.Note1Slugtestsareusuallyconsideredtoprovideestimatesofthelowerlimitoftheactualhydraulicconductivityofanaquiferbecausethetestresultsaresoheavilyinfluencedbywellefficiencyandboreholeskineffectsneartheopenportionofthewell.Theportionoftheaquiferthatistestedbytheslugtestislimitedtoanareaneartheopenportionofthewellwheretheaquifermaterialsmayhavebeenalteredduringwellinstallation,andthereforemaysignificantlyeffectthetestresults.Insomecasesthedatamaybemisinterpretedandresultinahigherestimateofhydraulicconductivity.Thisisduetotherelianceonearlytimedatathatisreflectiveofthehydraulicconductivityofthefilterpacksurroundingthewell.ThiseffectwasdiscussedbyBouwer.Inaddition,becauseoftherelianceonearlytimedata,inaquiferswithmediumtohighhydraulicconductivity,theearlytimeportionofthecurvethatisusefulforthisdataanalysesistooshort(forexample,10s)foraccuratemeasurement;therefore,thetestresultsbegintogreatlyunderestimatethetruehydraulicconductivity.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P13
【国际标准分类号】:07_060;93_020
【页数】:4P.;A4
【正文语种】: