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1、萬方數(shù)據(jù)第25卷第5期巖石力學(xué)與工程學(xué)報V01.25No.52006年5月ChineseJournalofRockMechanicsandEngineeringMay,2006巖石三維破裂過程的數(shù)值模擬研究梁正召1~,唐春安1,張永彬2,馬天輝2,張亞芳2(1.大連理工大學(xué)土木水利學(xué)院,遼寧大連116024:2.東北大學(xué)工程力學(xué)研究所,遼寧沈陽110004)瘸要:采用細(xì)觀彈性損傷模型和有限元計算方法實現(xiàn)巖石三維破裂過程的數(shù)值模擬??紤]到巖石非均勻性的本質(zhì)特征,通過引入簡單直觀的單元本構(gòu)模型,采用細(xì)觀單元材料性質(zhì)退化的辦法,利用
2、位移加載來實現(xiàn)巖石逐漸破裂過程;模擬單軸壓縮、單軸拉伸和剪切破裂3種基本試驗,得到巖石非線性應(yīng)力一應(yīng)變曲線和不同載荷階段三維損傷破裂演化系列圖像;分析細(xì)觀非均勻性對巖石宏觀破裂力學(xué)行為的影響。試驗研究表明,三維破裂LL---維破裂更為復(fù)雜,RFPA3D可以有效地模擬脆性材料的三維破裂。關(guān)t詞t數(shù)值模擬;三維破裂過程;非均勻性:細(xì)觀損傷中圈分類號lO242文獻(xiàn)標(biāo)識碼:A文章編號i1000—6915(2006)05—0931—063DNUMERICALSIMULATIoNoFFAILUREPRoCESSoFRoCKLIANGZhe
3、ngzha01~,TANGChun7anl,ZHANGYongbin2,MATianhui2,ZHANGYafan92r1.SchoolofCivilandHydraulicEngineering,DalianUniversityofTechnology,Dalian,Liaoning116024,China:2.EngineeringMechanicsInstitute,NortheasternUniversity,Shenyang,Liaoning110004,China)Abstract:Alinearelasticda
4、magemodelbasedonfiniteelementmethodatmesoscopiclevelwasappliedtoinvestigatethethree-dimensionalfailureprocessofrocksubjectedtovariousstressloadings.UniformcubeelementwasadoptedinRFPAⅢcodeandrockspecimenswerediscritisizedintouniformcubeelementswiththesafflesizeandsha
5、pe.Mechanicalpropertiesintheelements,includingelasticmodulusandpeakstrength,weredistributedwiththespecimensfollowingacertainstatisticalfunction.Ineachelement,themechanicalpropertieswerehomogenous.Theelasticmoduliandothermechanicalpropertieswereweakenedwhenthestresse
6、sintheelementsaresatistiedwiththefailurecriterion.Byfollowingasimpleelasto—brittleconstitutiverelation,thecomplete3Drockprogressivefailurewasobtained.Finally,threebasicexperimentswereconductedwithRFPA?.Completenonlinearstress—straincurvesaswellasfacturepicturesdurin
7、gdamageevolutionprocesswereobtained.Thenumericalsimulationresultsshowedthat3Dfailureprocesswasmuchmorecomplicatedthan2Dfailureprocess.ItalsoshowsRFPAmethodisausefulandeffectivetooltosimulatethefailureprocessofheterogeneousmatedals.Keywords:numericalsimulation;three—
8、dimensionalfailureprocess;heterogeneity:mesoscopicdamage1引言研究在外部載荷和環(huán)境作用下,材料中缺陷的演化規(guī)律及其導(dǎo)致材料最終失效或破壞的全過程,是力學(xué)家和材料科學(xué)家為之長期奮斗的跨學(xué)科命題Ⅲ。巖石應(yīng)力一應(yīng)變?nèi)^程曲線的