结构面剪切破坏特性及其在滑移型岩爆研究中的应用

doi:10.13722/j.cnki.jrme.2014.0337

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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.

Key words： slip of structure plane direct shear test mechanism of rockburst asperity height slip dislocation impact fracture

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0337 OR http://www.rockmech.org/EN/Y2015/V34/I09/21

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