HOEK-BROWN FAILURE CRITERION – 2002 EDITION

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1、HOEK-BROWNFAILURECRITERION–2002EDITIONEvertHoekConsultingEngineer,Vancouver,CanadaCarlosCarranza-TorresItascaConsultingGroupInc.,Minneapolis,USABrentCorkumRocscienceInc.,Toronto,CanadaABSTRACT:TheHoek-Brownfailurecriterionforrockmassesiswidelyacceptedandhasbeenappliedina

2、largenumberofprojectsaroundtheworld.While,ingeneral,ithasbeenfoundtobesatisfactory,therearesomeuncertaintiesandinaccuraciesthathavemadethecriterioninconvenienttoapplyandtoincorporateintonumericalmodelsandlimitequilibriumprograms.Inparticular,thedifficultyoffindinganaccep

3、tableequivalentfrictionangleandcohesivestrengthforagivenrockmasshasbeenaproblemsincethepublicationofthecriterionin1980.Thispaperresolvesalltheseissuesandsetsoutarecommendedsequenceofcalculationsforapplyingthecriterion.AnassociatedWindowsprogramcalled“RocLab”hasbeendevelo

4、pedtoprovideaconvenientmeansofsolvingandplottingtheequationspresentedinthispaper.1.INTRODUCTIONstrengthtozeroforverypoorqualityrockmasses(Hoek,WoodandShah,[7]).HoekandBrown[1,2]introducedtheirfailurecriterioninanattempttoprovideinputdatafortheOneoftheearlydifficultiesaro

5、sebecausemanyanalysesrequiredforthedesignofundergroundgeotechnicalproblems,particularlyslopestabilityexcavationsinhardrock.Thecriterionwasderivedissues,aremoreconvenientlydealtwithintermsoffromtheresultsofresearchintothebrittlefailureofshearandnormalstressesratherthanthe

6、principalintactrockbyHoek[3]andonmodelstudiesofstressrelationshipsoftheoriginalHoek-BrownjointedrockmassbehaviourbyBrown[4].Thecriterion,definedbytheequation:criterionstartedfromthepropertiesofintactrock0.5andthenintroducedfactorstoreducetheseσ'σ'=σ'+σm3+s(1)properti

7、esonthebasisofthecharacteristicsof13ciσcijointsinarockmass.Theauthorssoughttolinkthewhere''arethemajorandminoreffectiveempiricalcriteriontogeologicalobservationsbyσandσ31meansofoneoftheavailablerockmassprincipalstressesatfailureclassificationschemesand,forthispurpose

8、,theyσciistheuniaxialcompressivestrengthoftheintactchosetheRockMassRatingproposedbyrockmaterialandBieni