长江科学院院报 ›› 2018, Vol. 35 ›› Issue (3): 65-69.DOI: 10.11988/ckyyb.20171103

• 岩土力学试验与理论 • 上一篇    下一篇

坚硬煤岩组合体变形破坏特征及冲击特性研究

王宁1, 姜耀东2a,2b, 朱登元1, 闫正余1   

  1. 1.临沂大学 土木工程与建筑学院,山东 临沂 276005;
    2.中国矿业大学北京 a.力学与建筑工程学院;b.煤炭资源与安全开采国家重点实验室,北京 100083
  • 收稿日期:2017-09-25 出版日期:2018-03-01 发布日期:2018-03-16
  • 作者简介:王 宁(1989-),男,山东临沂人,讲师,博士,主要从事岩土力学及矿山压力方面的研究。E-mail:lucking_ning@163.com
  • 基金资助:
    国家重点基础研究发展计划(973)项目(2010CB226801)

Failure and Coal Bumps Characteristics of Hard Roof-coal Structure

WANG Ning1, JIANG Yao-dong2,3, ZHU Deng-yuan1, YAN Zheng-yu1   

  1. 1.School of Civil Engineering and Architecture, Linyi University, Linyi 276005, China;
    2.School of Mechanics and Civil Engineering, China University of Mining & Technology Beijing,Beijing 100083, China;
    3.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining & Technology Beijing,Beijing 100083, China
  • Received:2017-09-25 Online:2018-03-01 Published:2018-03-16

摘要: 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。

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

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.

Key words: coal bumps, compound coal-rock, stress condition, burst characteristics, deformation characteristics, failure mode of coal-rock

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