为研究冲击地压机理,考虑冲击地压发生的“顶板-煤层”组合结构,进行了不同加载条件下的单轴组合样品试验,通过分析坚硬煤岩组合体在不同加载条件下的变形发展过程和破坏特征,初步得到组合体破坏的基本形式以及可能的突变条件。研究结果表明:试样的变形破坏呈现明显发展过程,随加载速率的变化表现为渐进破坏、劈裂破坏和整体破坏3种形式,伴随内部承载结构的削弱,最终发生整体突然失稳。结合煤岩相对滑动特性,通过分析典型冲击矿井的开采地质条件和采动效应,明确了坚硬煤岩组合条件下冲击地压的破坏模式,可为后续有针对性的灾害防治提供参考。
Abstract
Uniaxial compression tests with different loading rates were conducted on standard samples of combination samples of “roof-coal” structure caused by coal bump. By analyzing the stress and strain development process and
acoustic emission response characteristics under different loading conditions, the basic damage modes and the possible conditions of abrupt change were obtained. The deformation and failure of the samples experienced obvious development stages with the increase of loading rate, namely progressive shear failure, splitting failure and structural failure. Sudden holistic instability eventually occurred with the weakening of internal bearing structure. Through analyzing the relative slip characteristics of composite structure and the geological conditions and mining effects of typical mines, the failure mode of coal bumps under the condition of compound coal-rock is clarified. The results offer reference for targeted failure control.
关键词
冲击地压 /
煤岩组合体 /
应力条件 /
冲击特性 /
变形破坏特征 /
煤岩破坏模式
Key words
coal bumps /
compound coal-rock /
stress condition /
burst characteristics /
deformation characteristics /
failure mode of coal-rock
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参考文献
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基金
国家重点基础研究发展计划(973)项目(2010CB226801)
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