SAE AS3239 Bolt, Machine-Double Hex Extended Washer Head, PD Shank, AMS 5662, .3750-24 UNJF-3A
时间:2024-05-03 23:53:19 来源: 标准资料网 作者：标准资料网 阅读：9968
Product Code:SAE AS3239
Title:Bolt, Machine-Double Hex Extended Washer Head, PD Shank, AMS 5662, .3750-24 UNJF-3A
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available
【英文标准名称】:StandardTestMethodfor(AnalyticalProcedure)forDeterminingTransmissivityofConfinedNonleakyAquifersbyUnderdampedWellResponsetoInstantaneousChangeinHead(SlugTest)
【原文标准名称】:通过低阻尼井回应顶部瞬间改变(定容积瞬息提水或注水试验)测定非越流性承压含水层透射率的(分析程序)标准试验方法
【标准号】:ASTMD5785-1995(2006)
【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】:水力(利)工程;含水土层;试验
【英文主题词】:aquifers;aquifertests;controlwells;groundwater;hydraulicconductivity;slugtest;storagecoefficient
【摘要】:Theassumptionsofthephysicalsystemaregivenasfollows:6.1.1Theaquiferisofuniformthicknessandconfinedbyimpermeablebedsaboveandbelow.6.1.2Theaquiferisofconstanthomogeneousporosityandmatrixcompressibilityandofhomogeneousandisotropichydraulicconductivity.6.1.3Theoriginofthecylindricalcoordinatesystemistakentobeonthewell-boreaxisatthetopoftheaquifer.6.1.4Theaquiferisfullyscreened.Theassumptionsmadeindefiningthemomentumbalanceareasfollows:6.2.1Theaveragewatervelocityinthewellisapproximatelyconstantoverthewell-boresection.6.2.2Flowislaminarandfrictionalheadlossesfromflowacrossthewellscreenarenegligible.6.2.3Flowthroughthewellscreenisuniformlydistributedovertheentireaquiferthickness.6.2.4Changeinmomentumfromthewatervelocitychangingfromradialflowthroughthescreentoverticalflowinthewellarenegligible.6.2.5Thesystemresponseisanexponentiallydecayingsinusoidalfunction.1.1Thistestmethodcoversdeterminationoftransmissivityfromthemeasurementofthedampedoscillationabouttheequilibriumwaterlevelofawell-aquifersystemtoasuddenchangeofwaterlevelinawell.Underdampedresponseofwaterlevelinawelltoasuddenchangeinwaterlevelischaracterizedbyoscillatoryfluctuationaboutthestaticwaterlevelwithadecreaseinthemagnitudeoffluctuationandrecoverytoinitialwaterlevel.Underdampedresponsemayoccurinwellstappinghighlytransmissiveconfinedaquifersandindeepwellshavinglongwatercolumns.1.2ThisanalyticalprocedureisusedinconjunctionwiththefieldprocedureTestMethodD4044forcollectionoftestdata.1.3LimitationsSlugtestsareconsideredtoprovideanestimateoftransmissivityofaconfinedaquifer.Thistestmethodrequiresthatthestoragecoefficientbeknown.Assumptionsofthistestmethodprescribeafullypenetratingwell(awellopenthroughthefullthicknessoftheaquifer),buttheslugtestmethodiscommonlyconductedusingapartiallypenetratingwell.Suchapracticemaybeacceptableforapplicationunderconditionsinwhichtheaquiferisstratifiedandhorizontalhydraulicconductivityismuchgreaterthanverticalhydraulicconductivity.Insuchacasethetestwouldbeconsideredtoberepresentativeoftheaveragehydraulicconductivityoftheportionoftheaquiferadjacenttotheopenintervalofthewell.Themethodassumeslaminarflowandisapplicableforaslugtestinwhichtheinitialwater-leveldisplacementislessthan0.1or0.2ofthelengthofthestaticwatercolumn.1.4ThistestmethodofanalysispresentedhereisderivedbyvanderKamp(1)basedonanapproximationoftheunderdampedresponsetothatofanexponentiallydampedsinusoid.AmorerigorousanalysisoftheresponseofwellstoasuddenchangeinwaterlevelbyKipp(2)indicatesthatthemethodpresentedbyvanderKamp(2)matchesthesolutionofKipp(1)whenthedampingparametervaluesarelessthanabout0.2andtimegreaterthanthatofthefirstpeakoftheoscillation(2).Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P13
【国际标准分类号】:93_160
【页数】:5P.;A4
【正文语种】: