【英文标准名称】:StandardTestMethodforFieldVaneShearTestinCohesiveSoil
【原文标准名称】:粘性土十字板剪切试验的标准试验方法
【标准号】:ASTMD2573-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D18.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:clay;exploration;in-situtest;sensitivity;shearstrength;undrainedstrength;vaneshear;Cohesivesoils;Fieldtesting--soil;Fieldvanesheartest;In-situsoil/rocktesting/analysis;Sheartesting--soil;Soil;Vanesheartest
【摘要】:Thistestmethodprovidesanindicationofin-situundrainedshearstrengthoffine-grainedclaysandsiltsorotherfinegeomaterialssuchasminetailings,organicmuck,andsubstanceswhereundrainedstrengthdeterminationisrequired.Thetestisapplicabletosoilswithundrainedstrengthsoflessthan200kPa(2tsf).Verysensitivesoilscanberemoldedduringvaneinsertion.Thistestmethodisusedextensivelyinavarietyofgeotechnicalexplorationstoevaluaterapidloadingstrengthfortotalstressanalysisofsaturatedfine-grainedclaysandsilts.Thetestisroutinelyperformedinconjunctionwithotherfieldandlaboratorytests.Thepeakundrainedshearresistanceofthevanetestiscommonlycorrectedtodeterminetheundrainedshearstrengthforgeotechnicalanalysis.Theagencyrequestingthetestingmustinterpretthesedatatodetermineapplicabilityforstrengthanalysis.Itisbeyondthescopeofthisstandardtorecommendapplicabilityofvanetestingforgeotechnicalanalysis.Forinformationonthegeneraluseofthesecorrectionfactors,consultAppendixX1.Thismethodisnotapplicableinsands,gravels,orotherhighpermeabilitysoils.Withtheshearingratesdescribedinthisstandard,sandlenses,ifpresent,willallowtotalorpartialdrainage.Soilswithhigherpermeability,inrapidshear,candilateorcollapseandgeneratenegativeorpositiveporepressureswhichmay,ormaynot,dissipateintheshearingprocess.Itisimportanttocheckthesoiltypebeingtested.Itisverybeneficialtosamplethesoileitherbeforeoraftertesting,tounderstandthedrainageconditions(permeability)ofthesoiltested.Thistestisoftenperformedindrilledboreholesorwithself-pushorself-drillingorpushed(vaneshoe)methods.Thismethodalsoappliestohandheldvanesheartestsperformedatshallowdepths,however,handheldequipmentmaybelessaccurate,becauseitmaybemoredifficulttomaintainvane/rodstabilityandverticality.Note28212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;StandardPracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoversthefieldvanetestinsaturatedclayandsiltsoilsfordeterminationofundrainedshearstrength.Knowledgeofthenatureofthesoilinwhicheachvanetestistobemadeisnecessaryforassessmentoftheapplicabilityandinterpretationofthetest.Thetestisnotapplicableforsandysoilswhichmayallowdrainageduringthetest.1.2Thistestmethodaddressestestingonlandandfortestingindrillholesorbyselfdrillingorcontinuouspushmethodsfromthegroundsurface.Thismethoddoesnotaddressspecificallymarinetestingwherespecialtestrequirementsorvariationsinequipmentmayberequired.TheuserisreferredtoASTMSTP1014foradditionalinformationonin-placevanesheartesting.1.3Thismethodisoftenusedinconjunctionwithfluidrotarydrilling(D5783)orhollow-stemaugers(D6151).Someapparatuseshavethevaneretractedinprotectiveshoeforadvancementandincrementaltesting.Sampling,suchaswiththinwalltubes(D1587)isoftencombinedwithvanetesting.Subsurfacegeotechnicalexplorationsarereportedinaccordancewithpractice(D5434).