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【英文标准名称】:StandardTestMethodforDeterminingSpecificCapacityandEstimatingTransmissivityattheControlWell
【原文标准名称】:在控制井上测定比容和评定过滤系数的标准试验方法
【标准号】:ASTMD5472-1993(2005)
【标准状态】:现行
【国别】:
【发布日期】:1993
【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】:地下水;含水土层;试验;液压传导性;观察井;储存系数;控制井中透光度评定;比容量;透光度;未封闭蓄水层;控制井
【英文主题词】:aquifers;aquifertests;controlwells;hydraulicconductivity;observationwells;specificcapacity;storagecoefficient;transmissivity;unconfinedaquifers
【摘要】:AssumptionsoftheTheis(1)equationaffectspecificcapacityandtransmissivityestimatedfromspecificcapacity.Theseassumptionsaregivenbelow:4.1.1Aquiferishomogeneousandisotropic.4.1.2Aquiferishorizontal,ofuniformthickness,andinfiniteinarealextent.4.1.3Aquiferisconfinedbyimpermeablestrataonitsupperandlowerboundaries.4.1.4DensitygradientintheflowingfluidmustbenegligibleandtheviscousresistancetoflowmustobeyDarcyrsquo;Law.4.1.5Controlwellpenetratesandreceiveswaterequallyfromtheentirethicknessoftheaquifer.4.1.6Controlwellhasaninfinitesimaldiameter.4.1.7Controlwelldischargesataconstantrate.4.1.8Controlwelloperatesat100percentefficiency.4.1.9Aquiferremainssaturatedthroughoutthedurationofpumping.ImplicationsofAssumptionsandLimitationsofMethod.4.2.1ThesimplifyingassumptionsnecessaryforsolutionoftheTheisequationandapplicationofthemethodareneverfullymetinafieldtestsituation.Thesatisfactoryuseofthemethodmaydependupontheapplicationofoneormoreempiricalcorrectionfactorsbeingappliedtothefielddata.4.2.2Generallythevaluesoftransmissivityderivedfromspecificcapacityvaryfromthosevaluesdeterminedfromaquifertestsutilizingobservationwells.Thesedifferencesmayreflect1)thatspecific-capacityrepresentstheresponseofasmallpartoftheaquifernearthewellandmaybegreatlyinfluencedbyconditionsnearthewellsuchasagravelpackorgradedmaterialresultingfromwelldevelopment,and2)effectsofwellefficiencyandpartialpenetration.4.2.3Thevaluesoftransmissivityestimatedfromspecificcapacitydataareconsideredlessaccuratethanvaluesobtainedfromanalysisofdrawdownsthatareobservedsomedistancefromthepumpedwell.1.1Thistestdescribesaprocedureforconductingaspecificcapacitytest,computingthespecificcapacityofacontrolwell,andestimatingthetransmissivityinthevicinityofthecontrolwell.Specificcapacityisthewellyieldperunitdrawdownatanidentifiedtimeafterpumpingstarted.1.2ThistestmethodisusedinconjunctionwithTestMethodD4050forconductingwithdrawalandinjectionwelltests.1.3ThemethodofdeterminingtransmissivityfromspecificcapacityisavariationofthenonequilibriummethodofTheis()fordeterminingtransmissivityandstoragecoefficientofanaquifer.TheTheisnonequilibriummethodisgiveninTestMethodD4106.1.4LimitationsThelimitationsofthetechniquefordeterminingtransmissivityareprimarilyrelatedtothecorrespondencebetweenthefieldsituationandthesimplifyingassumptionsoftheTheismethod.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.1.6Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotaddresssafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P12
【国际标准分类号】:
【页数】:4P.;A4
【正文语种】: