冲击地压与煤体自燃复合灾害特征及综合防治技术研究

    Research on characteristics and comprehensive prevention technology of composite disaster in rock burst and coal spontaneous combustion

    • 摘要: 冲击地压与煤体自燃复合灾害表现出新的特点严重威胁矿井安全开采。以内蒙古某矿31111工作面为研究对象,采用实验室实验、数值模拟和现场实践等方法对冲击地压与煤体自燃复合灾害特征进行研究,提出了控制回采速度与“一孔多用”综合防治冲击与自燃复合灾害技术方案。计算了不同氧化程度煤体冲击倾向性指标变化,得到了不同氧化程度煤体冲击倾向性,揭示了不同氧化煤体在单轴压缩下能量耗散和弹性应变能积累规律。模拟分析了采空区温度与不同开采速度下上覆岩层应力分布特征、能量释放及应力集中系数演化规律。

       

      Abstract: The composite disaster of rock burst and coal spontaneous combustion has shown new characteristics and seriously threatens the safety of mining. Taking the 31111 working face of a certain mine in Inner Mongolia as the research object, laboratory experiments, numerical simulations, and field application methods are used to study the characteristics of the composite disaster of rock burst and coal spontaneous combustion. A comprehensive prevention and control technical scheme for rock burst and spontaneous combustion composite disasters by controlling the mining speed and “one hole multiple uses” is proposed. The changes in the impact tendency index of coal bodies with different degrees of oxidation are calculated, and the impact tendency of coal bodies with different degrees of oxidation is obtained, revealing the energy dissipation and elastic strain energy accumulation laws of different oxidized coal bodies under uniaxial compression. The simulation analyzes the stress distribution characteristics, energy release, and evolution of stress concentration coefficient of overlying rock layers under different mining speeds and temperature in goaf.

       

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