隧洞岩爆孕育演化的细观力学机制.pdf

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1、第3l卷第4期矿冶工程V01．3lNo42011年08月MININGANDMETALLURGICALENGINEERINGAugust2011隧洞岩爆孕育演化的细观力学机制①王利，沈秀运，高谦(1．河南理工大学土木工程学院，河南焦作454000；2．河南理工大学基建处，河南焦作454000；3．北京科技大学土木与环境工程学院，北京100083)摘要：根据微损伤不可逆演化原理，利用有限元模型，模拟隧道断面在自适应位移加载条件下，从点状微损伤斑图到宏观贯通断裂的不可逆的跨尺度生长过程。模拟显示的破坏区与现场观察非常一致。岩爆的孕育演化是大大小小的“

2、V”形裂隙带将岩爆体从完整母岩中分划出来的过程。岩爆演化的细观力学机制研究表明，裂隙带扩展受滑移驱动作用控制，其扩展方向与最大剪切滑移方向一致，裂隙带的宏观表现是滑移带，内部具有张拉破裂的细观机制。随着滑移带扩展，最后可形成两个驱动核组成的驱动团，它们从相对方向将裂隙带贯通。裂隙带贯通前，驱动团上的承载力明显增大。岩爆孕育过程的声发射、微震或电磁、热效应监测对于岩石类动力灾害的临兆预测具有重要意义。关键词：深埋隧洞；岩爆；孕育；数值模拟；滑移裂隙带中图分类号：TD235文献标识码：A文章编号：0253—6099(2011)04—0014—04N

3、umericalSimulationonMeso．mechanismforGestationandEvolutionofRockBurstinDeeply．buriedTunnelWANGLi，SHENXiu。yun，GAOQian(1．CollegeofCivilEngineering，HenanPolytechnicUniversity，Jiaozuo454000，Henan，China；2．TheOfficeCampusConstructionProjects，HenanPolytechnicUniversity，Jiaozuo45400

4、0，Henan，China；3．SchoolofCivil&EnvironmentEngineering，BeifingUniversityofScienceandTechnologyBeo'ing100083，China)Abstract：Accordingtotheprincipleofirreversibledamageevolution，thefiniteelementmodelwasadoptedtosimulatetheireversibletrans-．scalegrowthofcross-．sectionofdeeply·-bu

5、riedtunnelfrompoint·-shapedmicro-damagestoband--shapedfracturesattheloadingofself-adaptivedisplacements．Thedamagedareainthesimulationwasconsistentwiththatobservedonsite．Thegestationandevolutionofrock—burstisaprocessinwhichalotofV—shapedfracturezoneswithdifferentsizeseparatef

6、romthesurroundingrockoftunnelbyarockburst．Thestudyonnleso—mechanismfortheevolutionofrockburstindicatedthatexpansionoffracturezoneswaslimitedbythedrivingforceofshearsliding，withexpansiondirectionbeinginlinewiththeshearslidingdirection．Somacroscopically，thefracturezoneisaslidi

7、ngband，butwithtensilecrackintermofmeso—mechanism．Withtheexpansionofthefracturezone，twodrivinggroupswithdrivingkernelsrHnthroughfracturezoneintheoppositedirections．Thebearingcapacityofdrivinggroupsobviouslyincreasedbeforerunningthroughfracturezone．Monitoringofacousticemission

8、，microseismorelectromagneticwaveandthermo—effectwillbeofimportantsignifican