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【英文标准名称】:StandardPracticeforUsingHollow-StemAugersforGeotechnicalExplorationandSoilSampling
【原文标准名称】:地质技术勘探和土壤取样用空茎轴螺旋钻使用的标准实施规程
【标准号】:ASTMD6151-2008
【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】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:continuoussampling;double-tubeauger;drilling;hollow-stemaugers;soilcoring;soilsampling;subsurfaceexploration;Double-tubeauger;Geotechnicalengineeringmaterials/processes;Hollow-stemaugerdrilling;Soilsampling;Subsurfaceinvestigation-
【摘要】:Hollow-stemaugersarefrequentlyusedforgeotechnicalexploration.Often,hollow-stemaugersareusedwithothersamplingsystems,suchassplitbarrelpenetrationresistancetesting,TestMethodD1586,orthin-walltubesampling,PracticeD1587(see2.5).Hollow-stemaugersmaybeusedtoadvanceadrillholewithoutsamplingusingapilotbitassembly,ortheymaybeequippedwithasamplingsystemforobtainingsoilcores.Insomesubsurfaceconditionsthatcontaincohesivesoils,thedrillholecanbesuccessfullyadvancedwithouttheuseofapilotbitassembly.Intermittentdrilling(advancingoftheHSAcolumnwithorwithoutapilotbit)andsamplingcanbeperformeddependingontheintervalstobesampled,orcontinuoussamplingcanbeperformed.Duringpausesinthedrillingandsamplingprocess,insitutestingorothersoilsamplingmethodscanbeperformedthroughthehollowaugercolumnbelowtheleadaugerassembly.Atcompletionoftheboringtothedepthofinterest,theholemaybeabandonedortestingormonitoringdevicescanbeinstalled.Hollow-stemaugerdrillingallowsfordrillingandcasingtheholesimultaneously,therebyeliminatingholecavingproblemsandcontaminationofsoilsamples(2).Thehollow-stemaugerdrillingandsamplingmethodcanbeasatisfactorymeansforcollectingsamplesofshallowunconsolidatedsubsurfacematerials(2).AdditionalguidanceonusecanbefoundinRefs.2,3,4,5,6.Soilsamplingwithadouble-tubehollow-stemsamplingsystemprovidesamethodforobtainingcontinuousorintermittentsamplesofsoilsforaccurateloggingofsubsurfacematerialstosupportgeotechnicaltestingandexploration.Awidevarietyofsoilsfromclaystosandscanbesampled.Thesamplingsystemscanbeparticularlyeffectiveindrysofttostiffclayeyorsiltydepositsbutalsocanworkwellundersaturatedconditions.Saturatedcohesionlesssoilssuchascleansandsmayflowandcaveduringdrilling(seeNote1).Inmanycases,theHSAsoilcoresamplingsystemcanproduceverylittledisturbancetothesampleandcanprovidesamplesforlaboratorytestsformeasurementofselectedengineeringproperties.Large-diametersoilcores,iftakencarefully,canprovideClassCandDsamplesasdescribedinPracticeD4220.TheHSAsystemscanalsoprovidedisturbedsamplesofunsaturatedsandsandgravelswithsomestructurepreserved.Full5-ft(1.5-m)longcoresusuallycannotbeobtainedinunsaturatedsandsduetoincreasingsidewallfrictionbetweenthedrysandsandinsidesurfaceofthesamplecorebarrel.Samplelengthof2to2.5ft.(0.60to0.75m)isgenerallythelimitofamountofsamplethatcanberecoveredinunsaturatedsandsbeforethefrictionbetweenthesamplerandthesandbecomestoohighandcausesblockingorpluggingofthesampler.Shorterlargediametercorerunsof2.5ftwiththe5-ftsamplebarrelsystem,orwitha2.5-ftsamplebarrelsystem,havegenerallyproventoresultinthebestsamples.Note18212;Researchonthin-wallpistonsamplingincleansandsindicatesthatingeneralitisimpossibletoobtaintrulyundisturbedsamplesofsaturatedcleansands.Thesesoilscandilateorcollapseuponinsertionofasamplingtube.Thehollow-stemaugerdouble-tubesystemcanonlyobtainpartitiallydisturbedsamplesofsandsbelowthewatertable.Hollow-stemaugerdrillingisconsideredashallowdrillingmethodwithmaximumdepthofdrillingof200to300ft(60to90m)dependingontorqueandpulldown/retractcapacityofthedrillingequipmentandsubsurfaceconditionsoftheformation(s)encountered.Saturatedlooseunconsolidateddepositsfurtherlimitmaximumdepththatcanbeattained.Hollow-stemaugerscanactascasings.......
【中国标准分类号】:D82
【国际标准分类号】:
【页数】:14P.;A4
【正文语种】:英语