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Fracture criterion of basic roof deformation in fully mechanized mining with large dip angle

机译：大倾角综采性挖掘基本屋顶变形的裂缝标准

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摘要

To explore the structure evolution of overlying strata and pressure characteristics of coal mining with large dip angle, the basic roof mechanical model was established that based on the thin plate theory and the development characteristics of 1212 (3) working face of Panbei Mine. The formula was deduced that used for calculating the basic roof stress distribution in large dip angle coal seam. It revealed the mechanism evolution of mining stress and its influence on overburden deformation. Furthermore, it was also discussed that the effect of false roof on the failure of the basic roof. It showed that the false roof increases the differentiation of gangue's filling rate in goaf and improves the evolution rate of basic roof fracture. It is the main influencing factor that the large dip angle leads to the "scoop" distribution of the stress and deformation in basic roof. It dominates the evolution of overburden fractures and the regional instability. The maximum deformation of the basic roof is located in the middle and upper part of the working face. This theoretical model is verified by means of numerical simulation and field monitoring.
机译：为了探讨大倾角煤矿覆盖层和压力特性的结构演变，建立了基于薄板理论的基本屋顶机械模型和彭北矿1212（3）台工作面的发展特征。推导出用于计算大倾角煤层中的基本屋顶应力分布的公式。它揭示了采矿压力的机制演变及其对覆盖层变形的影响。此外，还讨论了假屋顶对基本屋顶失效的影响。目前据认为，假屋顶增加了煤矸石灌装速率的差异，并提高了基本屋顶骨折的演化率。大倾角导致“勺”分布在基本屋顶上的应力和变形的主要影响因素是主要的影响因素。它占据了覆盖层骨折和区域不稳定的演变。基本屋顶的最大变形位于工作面的中部和上部。通过数值模拟和现场监控验证了该理论模型。

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  • 来源
    《Energy Exploration & Exploitation》 |2021年第3期|886-902|共17页
  • 作者

    Yang Ke; Wei Zhen; Chi Xiaolou; Gao Ansen; Fu Qiang;

  • 作者单位

    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 Anhui Prov & Minist Educ Huainan Peoples R China|Hefei Comprehens Natl Sci Ctr Inst Energy Hefei 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 Anhui Prov & Minist Educ 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 Anhui Prov & Minist Educ Huainan Peoples R China;

    China Univ Min & Technol Beijing 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 Anhui Prov & Minist Educ 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

    Large dip angle coal seam; thin plate model; filling rate; partition breaking; rock formation control;

    机译：大倾角煤层;薄板模型;填充率;分区破碎;岩层控制;

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