【英文标准名称】:StandardTestMethodsforCreepofRockCoreUnderConstantStressandTemperature
【原文标准名称】:在恒定应力和温度下岩芯蠕变的标准试验方法
【标准号】:ASTMD7070-2008
【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】:compressiontesting;creep;deformation;loadingtests;rock;triaxialcompression;Creep--rock;Deformation--rock;Rockstresstesting;Triaxialcompression
【摘要】:Therearemanyundergroundstructuresthatarecreatedforpermanentorlong-termuse.Often,thesestructuresaresubjectedtoanapproximatelyconstantload.Creeptestsprovidequantitativeparametersforstabilityanalysisofthesestructures.Thedeformationandstrengthpropertiesofrockcoresmeasuredinthelaboratoryusuallydonotaccuratelyreflectlarge-scaleinsituproperties,becausethelatterarestronglyinfluencedbyjoints,faults,inhomogeneities,weaknessplanes,andotherfactors.Therefore,laboratoryvaluesforintactspecimensmustbeemployedwithproperjudgmentinengineeringapplications.Note18212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod;theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthesefactors.1.1Thesetestmethodscoverthecreepbehaviorofintactsoftandhardrockcoreinfixedstatesofstressandtemperature.Theyspecifytheapparatus,instrumentation,andproceduresfordeterminingthestrainasafunctionoftimeundersustainedload.Hardrocksarethosewithamaximumaxialstrainatfailureoflessthan2%.Softrocksincludesuchmaterialsassaltandpotash,whichoftenexhibitverylargestrainatfailure.1.2ThisstandardreplacesandcombinesthefollowingStandardTestMethodsnowtobereferredtoasMethods:Methodx2018;Ax2019;(D5341CreepofHardRockCoreSpecimensinUniaxialCompressionatAmbient/ElevatedTemperatures);Methodx2018;Bx2019;(D4405CreepofSoftRockCoreSpecimensinUniaxialCompressionatAmbientorElevatedTemperature);andMethodx2018;Cx2019;(D4406CreepofRockCoreSpecimensinTriaxialCompressionatAmbientorElevatedTemperature).1.3AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.3.1Themethodusedtospecifyhowdataarecollected,calculated,orrecordedinthisstandardisnotdirectlyrelatedtotheaccuracytowhichthedatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandardisbeyonditsscope.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection7.
【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