基于楔块模型的煤壁极限稳定高度研究与应用

doi:10.13722/j.cnki.jrme.2021.0847

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摘要为确定煤壁极限稳定高度，对不同煤层条件的煤壁片帮特性进行研究。基于唯象法构建煤壁片帮三维模型，基于平衡微分方程得出煤壁片帮破坏面剖面轨迹线近似直线的结论；以此为基础，采用三维楔块简化模型建立煤壁片帮的应力方程，分析煤壁片帮剪切与张拉破坏机制，推导出煤壁极限稳定高度估算公式，将软煤剪切破坏和硬煤张拉破坏2种不同片帮形式统一到一个公式当中；依据实际工作面煤层条件参数，重点分析煤体泊松比、煤体黏聚力和内摩擦力、节理裂隙、煤–岩界面黏聚力和内摩擦力等煤层参数对煤壁极限稳定高度的影响，得出煤壁极限稳定高度随煤–岩界面和煤体的黏聚力、内摩擦力、泊松比的增大而增大的结论；在此基础上，研究护帮强度对煤壁稳定性的作用效果，给出考虑护帮强度的煤壁极限稳定高度估算公式，分析不同护帮装置的结构特点，提出液压支架护帮装置改进方案。最后，分别以河南禹州某矿软弱煤层和榆林矿区某矿坚硬煤层工作面为例，验证研究结果的有效性。理论研究结果与生产实践数据基本一致，较好地解释不同条件煤层煤壁稳定性特点，为超大采高工作面的煤壁稳定性控制和液压支架的设计优化提供理论支撑。

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	徐亚军1
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关键词 ：采矿工程, 楔块模型, 煤壁片帮, 泊松比, 黏聚力, 内摩擦力, 煤–岩界面

Abstract：In order to determine the ultimate mining height for ensuring the stability of coal wall，the characteristics of coal rib spalling under different coal seam conditions were studied. Based on the phenomenological method，the paper established the three-dimensional model and the equilibrium differential equation of the coal rib spalling，and obtained the section trajectory of the failure surface for coal rib spalling. On the basis of this，the stress equation of coal rib spalling was established by using three-dimensional simplified wedge model. By using unified formula to characterize two different rib spalling of soft coal shear failure and hard coal tensile failure，the paper analyzed the coal rib spalling mechanism of shear failure and tensile failure and put forward the formula of the ultimate mining height for ensuring the stability of coal wall. According to actual mining parameters of coal seam condition，the influence on coal wall stability limit height of coal seam parameters which include Poisson?s ratio，cohesion and internal friction，joint fissure，cohesion and internal friction of the coal and rock interface was mainly studied. The results showed that the coal wall stability limit height is increased by the increasing of the Poisson's ratio，cohesion and internal friction of coal rock interface cohesion and coal seam. Furthermore，on account of the research on the coal wall stability control effect of face guard supporting intensity，the paper put forward the estimate formula of the coal wall ultimate stability height considering the face guard supporting intensity and the improvement scheme of hydraulic powered support face guard device by analyzing the structural characteristics of different face guard devices. Finally taking the soft coal seam of Yuzhou mine in Henan province and the hard coal seam of Yulin mine in Shanxi province as examples，the validity of the research results was verified. The theoretical research results were basically consistent with the production practice data，which better explained the coal wall stability characteristics of coal seam under different conditions. The research could provide theoretical support for the coal wall stability control and the design optimization of hydraulic powered support in the super-large mining height mining face.

Key words： mining engineering wedge model rib spalling Passion?s ratio cohesion internal friction coal rock interface

引用本文:

徐亚军1，2，杜毅博1，2. 基于楔块模型的煤壁极限稳定高度研究与应用[J]. 岩石力学与工程学报, 2022, 41(S2): 3240-3249.
XU Yajun1，2，DU Yibo1，2. Research and application of coal wall limit stability height based on wedge model. , 2022, 41(S2): 3240-3249.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0847 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3240

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