《Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass》.pdf

《Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass》.pdf

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《Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass》.pdf

ActaMechanicaSinica(2014)30(4):547—558 DOI10.1007/s10409—014—0076一z RESEARCH PAPER Particleflow studyonstrengthandmeso.mechanism ofBrazilian splittingtestforjointedrockmass Sheng-QiYang·Yan-HuaHuang Received:2April2014/Revised:8May2014|Accepted:12June2014 ~TheChineseSocietyofTheoreticalandAppliedMechanicsandSpringer—VerlagBerlinHeidelberg2014 Abstract A discreteelementmethod(DEM)calledpar— iantest.(4)Thenotchangleandjointangleplayimportant ticleflow code(PFC )wasusedtoconstructamode1for rolesoncrackinitiationandpropagationcharacteristicsof Braziliandiscsplittingtestinthepresentstudy.Basedon jointedrockmassdiscspecimencontainingacentralstraight theexperimentalresultsofintactBraziliandiscofrock—like notchunderBraziliantest. materia1.asetofmicro.parametersinPFC thatreflected themacro—mechanicalbehaviorofrock—likematerialswere Keywords Jointedrockmass-Braziliansplittingtest·Ten— obtained.AndthenPFCz wasusedtosimulateBrazilian silestrength ·Failuremode.PFC 。 splittingtestforiointedrockmassspecimensandspecimen containingacentralstraightnotch.Thee髓 ctofointan— 1 Introduction gleandnotchangleonthetensilestrengthandfailuremode Thetensilestrength isan importantmaterialpraameterjn ofiointedrockspecimenswasdetailedanalyzed.Inorder rockmechanicsthatdescribesthelimitedstressunderten— torevealthemeso..mechanicalmechanism ofcrackcoales.. sion,becauserock materialsraemuchweakerin tension cence.displacementtrend1ineswereappliedtoanalyzethe than incompression.Brazilian splittingtestunderdiam displacementevolutionduringthecrackinitiationandprop— etercompressionhasbeenoneofthemainindirectmeth— agation.Theinvestigatedconclusionscanbedescribedas

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