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| THE SHEAR FAILURE CHARACTERISTIC OF THE STRUCTURAL PLANE AND ITS APPLICATION IN THE STUDY OF SLIP ROCKBURST |
| ZHOU Hui，MENG Fanzhen，ZHANG Chuanqing，YANG Fanjie，LU Jingjing |
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China) |
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Abstract It is revealed that extremely intense rockburst may be caused by shear slip of structural plane during excavation of the deeply buried tunnels of Jinping II Hydropower Station，so to study the controlling mechanism of structural plane to the slip burst，irregular serrated structural planes with three different asperity heights were made of cement mortar which is used as model material and direct shear tests were performed to investigate strength characteristics and failure mechanisms of structural planes at various asperity height，shearing velocity and normal stress，and mechanism of in-situ slip burst are analyzed preliminarily. Research results indicate that peak shear strength and residual shear strength of structural plane with different asperity heights increase with the increase of normal stress，and shear strength and inner friction angle increase with the increase of asperity height，besides，shear strength is found increase firstly then decrease with the increase of shear rate. Failure mechanism of structural planes under various conditions can be categorized into slip dislocation mechanism，tensile failure mechanism of footwall and hanging wall， and impact fracture of the front end of hanging wall and backend of footwall of the structural plane，moreover，the higher the asperity and the greater the normal stress，the larger the scale of impact fracture. Intensity and crater depth of the in-situ slip burst depend largely on stress concentration around the structural plane，and on the size，strength，location of asperities on the structural plane surface.
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| [1] ORTLEPP W D，STACEY T R. Rockburst mechanisms in tunnels and shafts[J]. Tunnelling and Underground Space Technology，1994，9(1)：59–65.
[2] 李地元. 高应力硬岩脆性板裂破坏和应变型岩爆机制研究[D].长沙：中南大学，2010.(LI Diyuan. Study on the brittle spalling failure of hard rock and the mechanism of strainburst under high in-situ stresses[D]. Changsha：Central South University，2010.(in Chinese))
[3] 苗金丽，何满潮，李德建，等. 花岗岩应变岩爆声发射特征及微观断裂机制[J]. 岩石力学与工程学报，2009，28(8)：1 593–1 603. (MIAO Jinli，HE Manchao，LI Dejian，et al. Acoustic emission characteristics of granite under strain rockburst test and its micro-fracture mechanism[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 593–1 603.(in Chinese))
[4] 陈卫忠，吕森鹏，郭小红，等. 脆性岩石卸围压试验与岩爆机制研究[J]. 岩土工程学报，2010，32(6)：963–969.(CHEN Weizhong，LÜ Senpeng，GUO Xiaohong，et al. Unloading confining pressure for brittle rock and mechanism of rock burst[J]. China Civil Engineering Journal，2010，32(6)：963–969.(in Chinese))
[5] 冯 涛. 岩爆机制与防治理论及应用研究[D]. 长沙：中南工业大学，1999.(FENG Tao. Rockburst mechanism and its prevention and application[D]. Changsha：Central South University of Technology，1999.(in Chinese))
[6] 张镜剑，傅冰骏. 岩爆及其判据和防治[J]. 岩石力学与工程学报，2008，27(10)：2 034–2 042. (ZHANG Jingjian，FU Bingjun. Rockburst and its criteria and control[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 034–2 042.(in Chinese))
[7] ZHANG C Q，FENG X T，ZHOU H，et al. Case histories of four extremely intense rockbursts in deep tunnels[J]. Rock mechanics and rock engineering，2012，45(3)：275–288.
[8] 潘一山，王来贵，章梦涛，等. 断层冲击地压发生的理论与试验研究[J]. 岩石力学与工程学报，1998，17(6)：642–649.(PAN Yishan，WANG Laigui，ZHANG Mengtao，et al. The theoretical and testing study of fault rockburst[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(6)：642–649.(in Chinese))
[9] GALYBIN A N. A model of mining-induced fault sliding[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1997，34(3)：682.
[10] WHITE B G.，WHYATT J K. Role of fault slip on mechanisms of rock burst damage，Lucky Friday Mine，Idaho，USA. In SARES 99：2nd Southern African Rock Engineering Symposium. Implementing Rock Engineering Knowledge，T.O. Hagan，ed.1999，pp：169–178.
[11] ORTLEPP W D. Note on fault-slip motion inferred from a study of microcataclastic particles from an underground shear rupture[J]. Pure and applied geophysics，1992，139(3/4)：667–695.
[12] KODIKARA J K，JOHNSTON I W. Shear behavior of irregular triangular rock-concrete joints[J]. International Journal of rock mechanics and mining science，1994，37(4)：313–322.
[13] MORADIAN Z A，BALLIVY G，RIVARD P，et al. Evaluating damage during shear tests of rock joints using acoustic emission[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(4)：590–598.
[14] 李海波，刘 博，冯海鹏，等. 模拟岩石节理试样剪切变形特征和破坏机制研究[J]. 岩土力学，2008，29(7)：1 741–1 746.(LI Haibo，LIU Bo，FENG Haipeng，et al. Study of deformability behaviour and failure mechanism by simulating rock joints sample under different loading conditions[J]. Rock and Soil Mechanics，2008，29(7)：1 741–1 746.(in Chinese))
[15] 朱小明，李海波，刘 博，等. 含二阶起伏体的模拟岩体节理试样剪切特性试验研究[J]. 岩土力学，2012，33(2)：354–360.(ZHU Xiaoming，LI Haibo，LIU Bo，et al. Experimental study of shear characteristics by simulating rock mass joints sample with second-order asperities[J]. Rock and Soil Mechanics，2012，33(2)：354–360.(in Chinese))
[16] 沈明荣，张清照. 规则齿型结构面剪切特性的模型试验研究[J]. 岩石力学与工程学报，2010，29(4)：713–719.(SHEN Mingrong，ZHANG Qingzhao. Experimental study of shear deformation characteristics of rock mass discontinuities[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 435–2 440.(in Chinese))
[17] 刘 博，李海波，朱小明. 循环剪切荷载作用下岩石节理强度劣化规律试验模拟研究[J]. 岩石力学与工程学报，2011，30(10)：2 033–2 039.(LIU Bo，LI Haibo，ZHU Xiaoming. Experiment simulation study of strength degradation of rock joints under cyclic shear loading[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：2 033–2 039.(in Chinese))
[18] 韩立军，宗义江，韩贵雷，等. 岩石结构面注浆加固抗剪特性试验研究[J].岩土力学，2011，32(09)：2 570–2 577.(HAN Lijun，ZONG Yijiang，HAN Guilei，etc. Study of shear properties of rock structural plane by grouting reinforcement[J]. Rock and Soil Mechnics，2011，32(9)：2 570–2 577.(in Chinese))
[19] 许宏发，金丰年. 岩体节理剪切变形的幂函数模型[J]. 岩石力学与工程学报，2000，(5)：314–317.(XU Hongfa，JIN Fengnian. The function model of shear deformation for rock joints[J]. Chinese Journal of Rock Mechanics and Engineering，2000，(5)：314–317.(in Chinese))
[20] CHEON D S，JEON S，PARK C，et al. Characterization of brittle failure using physical model experiments under polyaxial stress conditions[J]. International Journal of rock mechanics and mining science，2011，48(1)：152–160. |
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2015, Vol. 34 
