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1、岩石破坏全过程的连续-离散耦合分析方法马冈周创兵，常晓林，周伟(1.武汉大学水资源与水电工程科学国家重点实验室，湖北武汉430072：2.武汉大学水工岩石力学教育部逍点实验室,湖北武汉430072)摘要：在变形体离散元的框架内引入界面单元，提出模拟岩石等准脆性材料破坏过程的连续-离散耦合分析方法。假定损伤和断裂只发生在界而单元上,实体单元只产生弹性变形，采用带拉断的Mohr-Coulomb准则和标量损伤因子來模拟界面单元的损伤、火效过程,实现岩石山连续性向非连续性转换的物理过程。在数值试验屮，岩石细观尺度上单元的弹性模量和单轴抗压强度服从Wcibull概率分布并满足一定的相关
2、性。数值模拟结果农明：本文方法能反映岩石在加载过程屮的线弹性、非线性、软化、残余4个阶段和主要特点；能显式地模拟微裂缝的萌生、扩展直至贯通形成宏观裂缝的全过程；反映岩石强度的围压依赖性和脆・延■塑转换力学特性。关键词：岩石力学；变形体离散元；界面单元；数值试验；非均匀性；脆-延-塑转换中图分类号：TU45文献标识码：A文章编号：100()-6915(2011)12-2444-12CONTINUOUS-DISCONTINUOUSCOUPLINGANALYSISFORWHOLEFAILUREPROCESSOFROCKMAGang,ZHOUChuangbing,CHANGXiaol
3、in,ZHOUWei(1.StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,WuhanHubei430072,China；2.KeyLaboratoryofRockMechanicsinHydraulicStructuralEngineering,MinistryofEducationtWuhanUniversity,Wuhan,Hubei430072,China)Abstract：Intheframeworkofdeformationdiscreteelemen
4、tmethod,acontinuous-discontinuescouplingforsimulatingfailureprocessofquasi-brittlematerialssuchasrockisproposedbyintroducinginterfaceelement.Itisassumedthatdamageandfractureoccuronlyininterfaceelement,whilesolidelementhaselasticdeformation.Mohr-Coulombcriterionwithtensioncut-offisusedasdama
5、geinitiationcriterion；ascalardamagevariablerepresentingoveralldamageinthematerialisusedtodescribetherateatwhichthematerialstiffnessisdegraded；crackissimulatedexplicitlybyfailureofinterfaceelement.Continuous-discontinuoustransitionprocessofrockcanberealized・Inthenumericalexperiments,mechanic
6、alparametersofsolidelementarerandomlyallocatedaccordingtoWeibulldistributionandhavecertaincorrelation.Thenumericalsimulationresultsshowthatthesuggestedmethodcanreflectthelinearelasticity,nonlinearity,softeningandresidualphasesduringtheloadingprocessofrock；itcanexplicitlysimulatethecrackprop
7、agation.Thesimulationresultsalsoshowthatrockhasconfiningpressureeffectandbrittle-ductile-plastictransition.Keywords：rockmechanics；deformablediscreteelement；interfaceelement；numericalexperiment；heterogeneity；brittle-ductile-plastictransition1引言岩石的力学特性研究是水
