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【英文标准名称】:StandardPracticeforSonicDrillingforSiteCharacterizationandtheInstallationofSubsurfaceMonitoringDevices
【原文标准名称】:地下监视设备的场地特征和安装的声钻法标准实施规程
【标准号】:ASTMD6914-2004(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:drilling;resonance;soilandrocksampling;sonic;subsurfaceexploration;Sonicdrilling;Subsurfacemonitoringdevices
【摘要】:Sonicdrillingisusedforgeoenvironmentalinvestigativeprograms.Itiswellsuitedforenvironmentalprojectsofaproduction-orientatednature.Disposalofdrillingspoilsisamajorcostelementinanyenvironmentalproject.Sonicdrillingoffersthebenefitofsignificantlyreduceddrillcuttingsandreducedfluidproduction.Sonicdrillingoffersrapidformationpenetrationtherebyincreasingproduction.Itcanreducefieldworktimegeneratingoverallprojectcostreductions.Thecontinuouscoresamplerecoveredprovidesarepresentativelithologicalcolumnforreviewandanalysis.Sonicdrillingreadilylendsitselftoenvironmentalinstrumentationinstallationandtoin-situtesting.Theadvantageofacleancasedholewithouttheuseofdrillingfluidsprovidesforincreasedefficiencyininstrumentationinstallation.Theabilitytocausevibrationtothecasingstringeliminatesthecomplicationofbackfillbridgingcommontootherdrillingmethodsandreducestheriskofcasinglockupallowingforeasycasingwithdrawalduringgrouting.Thecleanboreholereduceswelldevelopmenttime.Pumpingtestscanbeperformedasneededpriortowellscreenplacementtoinsureproperscreenlocation.Thesonicmethodisreadilyutilizedinmultiplecasedwellapplicationswhicharerequiredtopreventaquifercrosscontamination.Notwithstandingthepossibilityofvibratoryeffectsonthesurroundingformations,thesamesonicdrillingplusfactorsforenvironmentalmonitoringdeviceinstallationscarryoverforgeotechnicalinstrumentationaswell.Theinstallationofinclinometers,vibratingwirepiezometers,settlementgauges,andthelikecanbeaccomplishedefficientlywiththesonicmethod.Thecuttingaction,asthesonicdrillingbitpassesthroughtheformation,maycausedisturbancetothesoilstructurealongtheboreholewall.Thevibratoryactionofdirectingthesampleintothesamplebarrelandthenvibratingitbackoutcancausedistortionofthespecimen.Coresamplescanbehydraulicallyextractedfromthesamplebarreltoreducedistortion.Theuseofsplitbarrels,withorwithoutliners,mayimprovethesampleconditionbutmaynotcompletelyremovethevibratoryeffect.Whenpenetratingrockformations,thevibrationmaycreatemechanicalfracturesthatcanaffectstructuralanalysisforpermeabilityandtherebynotreflectthetruein-situcondition.Sonicdrillinginrockwillrequiretheuseofairorfluidtoremovedrillcuttingsfromthefaceofthebit,astheygenerallycannotbeforcedintotheformation.Samplescollectedbythedrysoniccoringmethodfromdense,dry,consolidatedorcementedformationsmaybesubjectedtodrillinginducedheat.Heatisgeneratedbytheimpactofthebitontheformationandthefrictioncreatedwhenthecorebarrelisforcedintotheformation.Thesamplingbarrelisadvancedwithoutdrillingfluidwheneverpossible.Therefore,inverydenseformations,drillingfluidsmayhavetobeusedtoremovedrillcuttingsfromthebitfaceandtocontroldrillinggeneratedheat.Indry,denseformationsprecautionstocontroldrillinggeneratedheatmaybenecessarytoavoidaffectingcontaminantpresence.Theaffectsofdrillinggeneratedheatcanbemitigatedbyshorteningsamplingruns,changingvibrationlevelandrotationspeed,usingcooledsamplingbarrels,collectinglargerdiametersamplestoreduceaffectontheinteriorofthesample,andusingfluidcoringmethodsorbyusingalternatesamplingmethodssuchasthestandardpenetrationtesttypesamplersatspecificintervals.Heatgeneratedwhilecasingtheboreholethroughdenseformationsafterthecoresamplehasbeenextractedcanbealleviatedbypotablewaterinjectionand/orbyusingcrowd-incasingbitsthatsheartheformationwithminimalresistance.Shouldboreholewalldensificationbeaconcernitcanbealleviatedby......
【中国标准分类号】:P96
【国际标准分类号】:13_080_05
【页数】:11P.;A4
【正文语种】:英语