A physical model study of jointed rock mass strength under uniaxial compressive loading.pdf

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1、Tocitethispaper:Int.J.RockMech.&Min.Sci.34:3-4,paperNo.165.Copyright©1997ElsevierScienceLtdCopyright©1997ElsevierScienceLtdInt.J.RockMech.&Min.Sci.Vol.34,No.3-4,1997ISSN0148-9062Tocitethispaper:Int.J.RockMech.&Min.Sci.34:3-4,PaperNo.165APHYSICALMODELSTUDYO

2、FJOINTEDROCKMASSSTRENGTHUNDERUNIAXIALCOMPRESSIVELOADINGP.H.S.W.Kulatilake;W.He;J.Um;H.WangDept.ofMining&GeologicalEngineering,UniversityofArizona,Tucson,AZ85721,U.S.A.ABSTRACTJointedrockmassstrengthisinvestigatedthroughphysicalmodelingusingmodelmaterialblo

3、ckssubjectedtoonlyuniaxialcompressiveloading.Jointedmodelmaterialblocksexhibiteddifferentfailuremodesdependingonthejointconfigurations.Orientationofthejointsetsplayedasignificantrolerelatedtothemodesoffailure.Itwaspossibletoobtainastrongnon-linearrelationb

4、etweenthejointedmodelmassstrengthandthefracturetensorcomponenttocoverthestrengthsresultingfromallthedifferentfailuremodesobservedintheinvestigation.Thefracturetensorcomponentwasusedtoobtainthecombinedeffectofnumberofjointsets,jointdensity,anddistributionso

5、fsizeandorientationofthejointsetsinachosendirection.Neededfutureresearcharesuggestedtogeneralizethepromisingrockmassstrengthcriterionobtainedintheperformedresearch.Copyright©1997ElsevierScienceLtdKEYWORDSRockmassstrengthphysicalmodelingdiscontinuitiesaniso

6、tropyscaleeffectscompressivestrengthINTRODUCTIONAgoodunderstandingofthemechanicalpropertiesofjointedrockmassesisvitaltoarriveatsafeandeconomicaldesignsforstructuresbuiltinandonrockmasses.Thepresenceofvariousdiscontinuities,theinherentstatisticalnatureofthe

7、irgeometricalparameters,andtheuncertaintiesinvolvedintheestimationoftheirgeomechanicalandgeometricalpropertiesmakeitcomplicatedanddifficulttoaccuratelypredictthemechanicalpropertiesofjointedrockmasses.Somein-situtestshavebeencarriedouttostudytheeffectofsiz

8、eonrockmasscompressivestrength(Bieniawski1968;Prattetal.1972;Bieniawski,VanHeerden1975).Heuze1980hasreviewedthepreviousworkonscaleeffectsonmassstrength.Theresultsoftheseinvestigationsclearlyshowthereductionof