ASTM D5881-1995(2005) 通过临界阻尼井回应顶部瞬息变化测定承压非越流性含水土层渗透性的标准试验方法(分析程序)
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【英文标准名称】:StandardTestMethodfor(AnalyticalProcedure)DeterminingTransmissivityofConfinedNonleakyAquifersbyCriticallyDampedWellResponsetoInstantaneousChangeinHead(Slug)
【原文标准名称】:通过临界阻尼井回应顶部瞬息变化测定承压非越流性含水土层渗透性的标准试验方法(分析程序)
【标准号】:ASTMD5881-1995(2005)
【标准状态】:现行
【国别】:
【发布日期】:1995
【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】:液压导电率;含水土层系统;气压计的变化;监视井;有关应用;根据头的随时变化;地下水;过阻尼井;抽水率;储水系数;低阻尼井;水位观测;承压非越流性含水土层;冲击试验;灾害;过滤系数;环境控制;含水土层;土壤
【英文主题词】:aquifer;aquifertests;groundwater;hydraulicconductivity;observationwells;slugtest;storagecoefficient;transmissivity
【摘要】:Theassumptionsofthephysicalsystemaregivenasfollows:6.1.1Theaquiferisofuniformthickness,withimpermeableupperandlowerconfiningboundaries.6.1.2Theaquiferisofconstanthomogeneousporosityandmatrixcompressibilityandconstanthomogeneousandisotropichydraulicconductivity.6.1.3Theoriginofthecylindricalcoordinatesystemistakentobeonthewell-boreaxisatthetopoftheaquifer.6.1.4Theaquiferisfullyscreened.6.1.5Thewellis100%efficient,thatis,theskinfactor,f,anddimensionlessskinfactor,x03C3;,arezero.Theassumptionsmadeindefiningthemomentumbalanceareasfollows:6.2.1Theaveragewatervelocityinthewellisapproximatelyconstantoverthewell-boresection.6.2.2Frictionalheadlossesfromflowinthewellarenegligible.6.2.3Flowthroughthewellscreenisuniformlydistributedovertheentireaquiferthickness.6.2.4Changeinmomentumfromthewatervelocitychangingfromradialflowthroughthescreentoverticalflowinthewellarenegligible.1.1Thistestmethodcoversdeterminationoftransmissivityfromthemeasurementofwater-levelresponsetoasuddenchangeofwaterlevelinawell-aquifersystemcharacterizedasbeingcriticallydampedorinthetransitionrangefromunderdampedtooverdamped.Underdampedresponseischaracterizedbyoscillatorychangesinwaterlevel;overdampedresponseischaracterizedbyreturnofthewaterleveltotheinitialstaticlevelinanapproximatelyexponentialmanner.OverdampedresponseiscoveredinGuideD4043;underdampedresponseiscoveredinD5785.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwithGuideD4043andthefieldprocedureinTestMethodD4044forcollectionoftestdata.1.3Limitations8212;Slugtestsareconsideredtoprovideanestimateofthetransmissivityofanaquifernearthewellscreen.Themethodisapplicableforsystemsinwhichthedampingparameter,950;,iswithintherangefrom0.2through5.0.Theassumptionsofthemethodprescribeafullypenetratingwell(awellopenthroughthefullthicknessoftheaquifer)inaconfined,nonleakyaquifer.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P22
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:
【原文标准名称】:通过临界阻尼井回应顶部瞬息变化测定承压非越流性含水土层渗透性的标准试验方法(分析程序)
【标准号】:ASTMD5881-1995(2005)
【标准状态】:现行
【国别】:
【发布日期】:1995
【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】:液压导电率;含水土层系统;气压计的变化;监视井;有关应用;根据头的随时变化;地下水;过阻尼井;抽水率;储水系数;低阻尼井;水位观测;承压非越流性含水土层;冲击试验;灾害;过滤系数;环境控制;含水土层;土壤
【英文主题词】:aquifer;aquifertests;groundwater;hydraulicconductivity;observationwells;slugtest;storagecoefficient;transmissivity
【摘要】:Theassumptionsofthephysicalsystemaregivenasfollows:6.1.1Theaquiferisofuniformthickness,withimpermeableupperandlowerconfiningboundaries.6.1.2Theaquiferisofconstanthomogeneousporosityandmatrixcompressibilityandconstanthomogeneousandisotropichydraulicconductivity.6.1.3Theoriginofthecylindricalcoordinatesystemistakentobeonthewell-boreaxisatthetopoftheaquifer.6.1.4Theaquiferisfullyscreened.6.1.5Thewellis100%efficient,thatis,theskinfactor,f,anddimensionlessskinfactor,x03C3;,arezero.Theassumptionsmadeindefiningthemomentumbalanceareasfollows:6.2.1Theaveragewatervelocityinthewellisapproximatelyconstantoverthewell-boresection.6.2.2Frictionalheadlossesfromflowinthewellarenegligible.6.2.3Flowthroughthewellscreenisuniformlydistributedovertheentireaquiferthickness.6.2.4Changeinmomentumfromthewatervelocitychangingfromradialflowthroughthescreentoverticalflowinthewellarenegligible.1.1Thistestmethodcoversdeterminationoftransmissivityfromthemeasurementofwater-levelresponsetoasuddenchangeofwaterlevelinawell-aquifersystemcharacterizedasbeingcriticallydampedorinthetransitionrangefromunderdampedtooverdamped.Underdampedresponseischaracterizedbyoscillatorychangesinwaterlevel;overdampedresponseischaracterizedbyreturnofthewaterleveltotheinitialstaticlevelinanapproximatelyexponentialmanner.OverdampedresponseiscoveredinGuideD4043;underdampedresponseiscoveredinD5785.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwithGuideD4043andthefieldprocedureinTestMethodD4044forcollectionoftestdata.1.3Limitations8212;Slugtestsareconsideredtoprovideanestimateofthetransmissivityofanaquifernearthewellscreen.Themethodisapplicableforsystemsinwhichthedampingparameter,950;,iswithintherangefrom0.2through5.0.Theassumptionsofthemethodprescribeafullypenetratingwell(awellopenthroughthefullthicknessoftheaquifer)inaconfined,nonleakyaquifer.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P22
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:
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