ASTM D5084-2010 使用一个柔性墙渗透仪测定饱和多孔材料的透水性的标准试验方法

作者:标准资料网 时间:2024-05-21 09:03:22  浏览:9286   来源:标准资料网

【英文标准名称】:StandardTestMethodsforMeasurementofHydraulicConductivityofSaturatedPorousMaterialsUsingaFlexibleWallPermeameter
【原文标准名称】:使用一个柔性墙渗透仪测定饱和多孔材料的透水性的标准试验方法
【标准号】:ASTMD5084-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D18.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:coefficientofpermeability;constanthead;constantrateofflow;constantvolume;fallinghead;hydraulicbarriers;hydraulicconductivity;liner;permeability;permeameter;Coefficientofpermeability;Compactionmeasurement--soils;Constanthead
【摘要】:Thesetestmethodsapplytoone-dimensional,laminarflowofwaterwithinporousmaterialssuchassoilandrock.Thehydraulicconductivityofporousmaterialsgenerallydecreaseswithanincreasingamountofairintheporesofthematerial.Thesetestmethodsapplytowater-saturatedporousmaterialscontainingvirtuallynoair.Thesetestmethodsapplytopermeationofporousmaterialswithwater.Permeationwithotherliquids,suchaschemicalwastes,canbeaccomplishedusingproceduressimilartothosedescribedinthesetestmethods.However,thesetestmethodsareonlyintendedtobeusedwhenwateristhepermeantliquid.SeeSection6.Darcy''slawisassumedtobevalidandthehydraulicconductivityisessentiallyunaffectedbyhydraulicgradient.Thesetestmethodsprovideameansfordetermininghydraulicconductivityatacontrolledlevelofeffectivestress.Hydraulicconductivityvarieswithvaryingvoidratio,whichchangeswhentheeffectivestresschanges.Ifthevoidratioischanged,thehydraulicconductivityofthetestspecimenwilllikelychange,seeAppendixX2.Todeterminetherelationshipbetweenhydraulicconductivityandvoidratio,thehydraulicconductivitytestwouldhavetoberepeatedatdifferenteffectivestresses.Thecorrelationbetweenresultsobtainedusingthesetestmethodsandthehydraulicconductivitiesofin-placefieldmaterialshasnotbeenfullyinvestigated.Experiencehassometimesshownthathydraulicconductivitiesmeasuredonsmalltestspecimensarenotnecessarilythesameaslarger-scalevalues.Therefore,theresultsshouldbeappliedtofieldsituationswithcautionandbyqualifiedpersonnel.Inmostcases,whentestinghighswellpotentialmaterialsandusingaconstant-volumehydraulicsystem,theeffectiveconfiningstressshouldbeabout1.5timestheswellpressureofthetestspecimenorastresswhichpreventsswelling.Iftheconfiningstressislessthantheswellpressure,anomalousflowconditionsmyoccur;e.g.,mercurycolumn(s)moveinthewrongdirection.Note18212;Thequalityoftheresultproducedbythisstandardisdependentofthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting,sampling,inspection,etc..UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thesetestmethodscoverlaboratorymeasurementofthehydraulicconductivity(alsoreferredtoascoefficientofpermeability)ofwater-saturatedporousmaterialswithaflexiblewallpermeameterattemperaturesbetweenabout15and30x00B0;C(59and86x00B0;F).Temperaturesoutsidethisrangemaybeused;however,theuserwouldhavetodeterminethespecificgravityofmercuryandRT(see10.3)atthosetemperaturesusingdatafromHandbookofChemistryandPhysics.Therearesixalternatemethodsorhydraulicsystemsthatmaybeusedtomeasurethehydraulicconductivity.Thesehydraulicsystemsareasfollows:
【中国标准分类号】:G31
【国际标准分类号】:91_100_50
【页数】:23P.;A4
【正文语种】:英语