【英文标准名称】:StandardTestMethodforRockBoltAnchorPullTest
【原文标准名称】:石栓锚定拉力试验的标准试验方法
【标准号】:ASTMD4435-2008
【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】:D18.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:anchors(rock);displacement;fieldtesting;loadingtests;mines;pulltesting;rock;sheartesting;Anchorbolts;Displacement--rockenvironments;Fieldtesting--rock;Loadingtests--rock/relatedmaterials;Mines;Pulltesting;Rockmaterials/properties
【摘要】:Rockboltsareusedforsupportinavarietyofminingandcivilengineeringsituations.Thepulltestmaybeusedtoprovideaquantitativemeasureoftherelativeperformanceofdifferentanchorsystemsinthesamerocktype.Anchorsystemsmaybedifferentmechanicalanchorsordifferentbondmaterialsorlengthsforgroutedanchors.Suchdatacanbeusedtochooseananchortypeanddetermineboltlength,spacing,andsize.Theobjectiveofthemethodistomeasureanchorperformance,andnottheperformanceoftherockboltitself.Thus,toensurethattheboltresponseduringthetestisminimalandpredictable,highstrength,short-length(6to8ft(1.8to2.5m))boltshavebeenspecified.Theboltshouldbejustlongenoughtoensurethatnofailureoftherockmassoccurs.Ideally,therockboltanchorshouldfailbyshearattheanchor-rockinterfaceorbond.Therefore,thelocalcharacteristicsoftherock,suchasroughnessandinducedfractures,aresignificantfactorsintheanchorstrength.Toobtainrealisticstrengthvalues,thetestholesshouldbedrilledusingthesamemethodsastheconstructionrockboltholes.Rockswithsignificanttime-dependentbehavior,suchasrocksaltorshale,mayrespondtotheanchorsystemitselfandchangetheanchorstrength.Inthesecases,considerationshouldbegiventotestingboltsoveraperiodoftime.Inestablishingatestingprogram,thefollowingfactorsshouldbeconsidered:Anchorpulltestsshouldbeconductedinallrocktypesinwhichconstructionboltswillbeinstalled.Iftherockisanisotropic,forexample,beddedorschistose,thetestsshouldbeconductedinvariousorientationsrelativetotheanisotropy,includingthoseatwhichtheconstructionboltmaybeinstalled.Ineachrocktype,ateachorientation,andforeachanchorsystem,asufficientnumberoftestsshouldbeconductedtodeterminetheaverageboltcapacitieswithinafixeduncertaintyatthe95%confidencelevel.Theallowableuncertaintybanddependsontheprojectandinvolvessuchfactorsastherockquality,expectedprojectlifetime,andimportanceoftheareastobebolted.Itsdeterminationwillrequireconsiderableengineeringjudgment.Asaroughguideline,atleast10to12pulltestsforasinglesetofvariableshavebeenfoundnecessarytosatisfythestatisticalrequirements.Note18212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod;theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Theobjectiveofthistestmethodistomeasuretheworkingandultimatecapacitiesofarockboltanchor.Thismethoddoesnotmeasuretheentireroofsupportsystem.Thismethodalsodoesnotincludetestsforpretensionedboltsormineroofsupportsystemevaluation.1.2Thistestmethodisapplicabletomechanical,cementgrout,resin,(epoxy,polyester,andthelike),orothersimilaranchorsystems.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026......
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:6P.;A4
【正文语种】:英语