【英文标准名称】:StandardTestMethod(AnalyticalProcedure)forDeterminingHydraulicPropertiesofaConfinedAquiferandaLeakyConfiningBedwithNegligibleStoragebytheHantush-JacobMethod
【原文标准名称】:用Hantash-Jacob方法测定具有微量存储的越流性隔水层和封闭含水层水压特性的标准试验方法
【标准号】:ASTMD6029-1996(2010)e1
【标准状态】:现行
【国别】:美国
【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】:
【英文主题词】:aquifers;aquifertests;confinedaquifers;confiningbeds;controlwells;groundwater;hydraulicproperties;leakance;leakyaquifers;observationwells;storagecoefficient;transmissivity;Aquifers;Confinedaquifers;Controlwells;Ground
【摘要】:Assumptions:Thecontrolwelldischargesataconstantrate,Q.Thecontrolwellisofinfinitesimaldiameterandfullypenetratestheaquifer.Theaquiferishomogeneous,isotropic,andareallyextensive.Theaquiferremainssaturated(thatis,waterleveldoesnotdeclinebelowthetopoftheaquifer).Theaquiferisoverlain,orunderlain,everywherebyaconfiningbedhavingauniformhydraulicconductivityandthickness.Itisassumedthatthereisnochangeofwaterstorageinthisconfiningbedandthatthehydraulicgradientacrossthisbedchangesinstantaneouslywithachangeinheadintheaquifer.Thisconfiningbedisboundedonthedistalsidebyauniformheadsourcewheretheheaddoesnotchangewithtime.Theotherconfiningbedisimpermeable.Leakageintotheaquiferisverticalandproportionaltothedrawdown,andflowintheaquiferisstrictlyhorizontal.Flowintheaquiferistwo-dimensionalandradialinthehorizontalplane.ThegeometryofthewellandaquifersystemisshowninFig.1.1.1Thistestmethodcoversananalyticalprocedurefordeterminingthetransmissivityandstoragecoefficientofaconfinedaquiferandtheleakancevalueofanoverlyingorunderlyingconfiningbedforthecasewherethereisnegligiblechangeofwaterinstorageinaconfiningbed.Thistestmethodisusedtoanalyzewater-levelorheaddatacollectedfromoneormoreobservationwellsorpiezometersduringthepumpingofwaterfromacontrolwellataconstantrate.Withappropriatechangesinsign,thistestmethodalsocanbeusedtoanalyzetheeffectsofinjectingwaterintoacontrolwellataconstantrate.1.2ThisanalyticalprocedureisusedinconjunctionwithTestMethodD4050.1.3Limitations8212;ThevaliduseoftheHantush-JacobmethodislimitedtothedeterminationofhydraulicpropertiesforaquifersinhydrogeologicsettingswithreasonablecorrespondencetotheassumptionsoftheTheisnonequilibriummethod(TestMethodD4106)withtheexceptionthatinthiscasetheaquiferisoverlain,orunderlain,everywherebyaconfiningbedhavingauniformhydraulicconductivityandthickness,andinwhichthegainorlossofwaterinstorageisassumedtobenegligible,andthatbed,inturn,isboundedonthedistalsidebyazoneinwhichtheheadremainsconstant.Thehydraulicconductivityoftheotherbedconfiningtheaquiferissosmallthatitisassumedtobeimpermeable(seeFig.1).1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunits,whichareprovidedforinformationonlyandarenotconsideredstandard.1.4.1Theconvertedinch-poundunitsusethegravitationalsystemofunits.Inthissystem,thepound(lbf)representsaunitofforce(weight),whiletheunitformassisslugs.Theconvertedslugunitisnotgiven,unlessdynamic(F=ma)calculationsareinvolved.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.FIG.1CrossSectionThroughaDischargingWellinaLeakyAquifer(fromReed(1)).4TheConfi......
【中国标准分类号】:P13
【国际标准分类号】:13_060_10
【页数】:11P.;A4
【正文语种】:英语