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1、Int.J.RockMech.Min.Sci.&Geomech.Abstr.Voi.19,pp.123to133,19820148-9062/82/030123-11$03.00/0PrintedinGreatBritain.AllrightsreservedCopyright?1982PergamonPressLtdAConstitutiveModelfortheMechanicalPropertiesofRockK.J.CHANG*:~T.-W.YANGI"Anewconstitutivemodelforthestudyofthemechanicalpropertiesofrocki
2、spresented.Inthismodel,theauthorscombineanewlyintroducedspring-bonding-blocksysteminparallelwithValanis-typeendochronicelements,andshowthatitcancharacterizethestressrelaxationphenomenon,thepost-failureresponse,andtheprogressivestiffnessreductionbehaviorofrockunderuniaxialcompressiveloading.Thespr
3、ino-bondino-blocksystemistimeindependent,itconsistsofaninfinitenumberofprogressivelyfracturingelas-ticelementsthatcharacterizestheprogressivestiffnessreductionbehaviorofrock.Theendochronicelementsaretimedependent,theyprovideinelasticdeformationandmakerelaxationformulationpossible.Thenewmodelshoul
4、dbeapplicabletootherbrittlematerialssuchasice,soil,andconcrete.INTRODUCTIONemployedinthestudiesofmetals[17-23,1,polymers[24-26],andsoil[27,28,1,andinthefieldoffractureTheoreticalstudiesoftheconstitutivepropertiesofmechanics[29-31,1.Ithasbeenproventhatthetheoryrockhavebeenofinteresttoinvestigators
5、inthefieldcansuccessfullypredictsuchcomplexphenomenainofrockmechanicsformanyyears.Intheliterature,itmetalsascross-hardening[18],behaviorintensioninhasbeennotedthatwhenarockspecimenissubjectedthepresenceofshearprestress1-183,cyclichardeningtoaconstantstrain-rateuniaxialcompressiveloadinaandsofteni
6、ng[221,cycliccreepandrelaxation[21],servo-controlled,stifftestingmachine,thefollowingareandfractureundercyclicstrain[291,andinsoilasobserved:cyclicstress-strainbehavior[27,283.Valanis[32-37](1)Undermonotonicloading,brittlerocksarehasalsoadvancedandimprovedthistheoryconsider-deformedinacontrolledm
7、annerbeyondtheirultimateablysince1971.strengthtothepost-failureregion[1-4](Fig.1).Byadoptingtheconceptofintrinsictimemeasure(2)Incyclicloadingthestiffnessofbrittlerockde-introducedbyValanis[17,18]andusingadifferentcrea
