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Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

机译：陡峭浸渍工作面的再生屋顶和不稳定支持控制对策分析

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摘要

Roof regeneration in coal mining occurs when the remaining bottom slice of thick coal is re-mined. In view of the challenges of roof fall and instability support of a regenerative roof in the mining of steeply dipping coal seams, combined with the geological and engineering conditions of the working face in the Panbei Coal Mine, the mechanism of the instability of the regenerative roof and support is studied, and control countermeasures are proposed. Based on the comprehensive combination of the measurement of the roof structure, physical simulation, numerical simulation, and theoretical analysis, the cementation and compaction degree of the regenerated roof were described. The caving and sliding law of the regenerated roof after bottom slice mining was explored, and the model of support dumping and sliding instability under the roof fall state was established. The results obtained yielded three main findings. Firstly, the compaction degree of the regenerative roof is higher than that of the middle part of the working face, and the compaction degree of the upper part of the working face is the smallest. Secondly, the overburden structure instability of the bottom slice underwent six stages. The fracture of the cantilever beam and the slippage of gangue are the reasons for the enhancement of the acoustic signal at each stage. Finally, the upper part of the stope was identified as the crucial zone in the prevention and control of the support instability. A moving method of metal mesh with pressure and roof scraping was developed, and the support anti-overturning and anti-skid jack was set up to effectively control the stability of the support and roof fall, for safe and efficient mining of a steeply dipping coal seam under a regenerative roof.
机译：当剩余的粗煤层重新开采时，煤炭开采中的屋顶再生发生。鉴于屋顶落下和稳定性屋顶在陡峭浸煤接缝采矿中的不稳定支持的挑战，结合番木矿煤矿工作面的地质和工程条件，再生屋顶不稳定的机制研究了支持，并提出了控制对策。基于屋顶结构的测量，物理仿真，数值模拟和理论分析的综合组合，描述了再生屋顶的胶结和压实程度。探讨了底部切片开采后再生屋顶的塌陷和滑动律，建立了屋顶落区下的支撑倾卸和滑动不稳定模型。得到的结果产生了三种主要结果。首先，再生屋顶的压实程度高于工作面的中间部分的压实程度，工作面的上部的压实程度是最小的。其次，底部切片的覆盖层结构不稳定六个阶段。悬臂梁的骨折和煤矸石的滑动是在每​​个阶段加强声学信号的原因。最后，术的上部被鉴定为预防和控制支持不稳定的关键区域。开发了一种具有压力和屋顶刮擦的金属滤网的移动方法，建立了支撑倾覆和防滑千斤顶，以有效地控制支撑件和屋顶跌落的稳定性，以便安全有效地采矿的陡峭浸渍煤炭在再生屋顶下的缝。

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  • 来源
    《Energy Exploration & Exploitation》 |2020年第4期|1082-1098|共17页
  • 作者

    Chi Xiaolou; Yang Ke; Fu Qiang;

  • 作者单位

    Anhui Univ Sci & Technol Key Lab Min Coal Safety & Efficiently Constructed Huainan Peoples R China|Anhui Univ Sci & Technol State Key Lab Min Response & Disaster Prevent & C Huainan Peoples R China;

    Anhui Univ Sci & Technol Key Lab Min Coal Safety & Efficiently Constructed Huainan Peoples R China|Anhui Univ Sci & Technol State Key Lab Min Response & Disaster Prevent & C Huainan Peoples R China;

    Anhui Univ Sci & Technol Key Lab Min Coal Safety & Efficiently Constructed Huainan Peoples R China|Anhui Univ Sci & Technol State Key Lab Min Response & Disaster Prevent & C Huainan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Regenerated roof; steeply dipping coal seam; re-mining; instability mechanism; control countermeasure;

    机译：再生屋顶;陡峭浸渍煤层;重新开采;不稳定机制;控制对策;

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