近距离煤层回采扰动下巷道分区段底鼓控制方法研究
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山西能源学院

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山西省重点研发计划项目(社会发展)(201903D321080);山西省晋中市科技重点研发计划(工业)(Y201026)


Research on the Control Method of Roadway Sub-sections Bottom Drum under the Disturbance of Close Coal Seam Mining
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Shanxi Institute of Energy,Shanxi,Jinzhong,030600

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    摘要:

    针对近距离煤层开采过程中下伏煤层巷道底鼓问题,本文采用数值模拟与现场监测相结合的方法,对某矿近距离煤层巷道底鼓控制方法进行了研究。结果表明:随着上伏煤层工作面推进,下伏煤层巷道所受应力表现为先增加后降低特征,应力峰值出现在工作面距巷道15m位置,该处巷道最大垂直应力达28.5MPa,巷道顶底板及两帮位移分别达195mm、773mm与135mm,巷道底板变形最为严重。据此研究提出了巷道底板切槽卸压与“U型钢+反底拱”加强支护相结合的分区段底鼓控制方法,给出了合理的切槽卸压参数。通过现场实践,巷道底板切槽卸压段与加强支护段的底板最大垂直位移分别降低62.1%与58.1%,实现了近距离煤层巷道底鼓的有效控制。

    Abstract:

    Aiming at the problem of tunnel bottom drum of the underlying coal seam in the process of short-distance mining, this paper uses the method of combining numerical simulation and field monitoring to study the control method of the tunnel bottom drum of the close- distance coal seam in a mine. The results show that as the working face of the overlying coal seam advances, the stress on the roadway of the underlying coal seam first increases and then decreases, and the stress peak appears at the position 15m from the working face to the roadway, where the maximum vertical stress of the roadway is 28.5MPa, and the displacement of the roof and floor and the two sides are 195mm, 773mm and 135mm respectively, and the deformation of the roadway floor is the most serious. Based on this research, a sub-section floor drum control method is proposed, which combines the pressure relief of roadway floor cutting grooves and the strengthening support of "U-shaped steel + reverse bottom arch", and the reasonable pressure relief groove parameters are given.. Through field practice, the maximum vertical displacement of the floor in the grooved pressure relief section and the reinforcement support section of the roadway floor was reduced by 62.1% and 58.1%, respectively, realizing the effective control of the bottom heave of the coal seam roadway.

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  • 收稿日期:2022-04-13
  • 最后修改日期:2022-04-24
  • 录用日期:2022-05-24
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