煤炭工程 ›› 2023, Vol. 55 ›› Issue (5): 45-51.doi: 10.11799/ce202305008

• 施工技术 • 上一篇    下一篇

宋新庄煤矿顶板密集钻孔切顶卸压护巷技术研究

赵毅1,解洪鑫2,姚强岭3   

  1. 1. 中国石化长城能源化工(宁夏)有限公司
    2. 中国矿业大学
    3. 江苏徐州中国矿业大学矿业工程学院
  • 收稿日期:2022-11-23 修回日期:2023-02-08 出版日期:2023-05-19 发布日期:2023-05-19
  • 通讯作者: 解洪鑫 E-mail:xhx1998xhx@163.com

Song Xinzhuang coal mine roof dense drilling cutting and pressure relief protection technology research

  • Received:2022-11-23 Revised:2023-02-08 Online:2023-05-19 Published:2023-05-19

摘要: 宋新庄煤矿110303工作面回风巷受110301工作面采动影响,巷道呈现大变形特征而无法满足正常生产需要。因此,在采区对翼110302工作面回采期间于运输巷顶板施工密集钻孔切顶卸压技术,进而优化110304回风巷采后侧向应力分布。结合工作面地质条件,通过理论分析与FLAC3D数值模拟,确定了切顶高度、角度、孔间距等关键技术参数,研究了切顶前后巷道围岩应力演化规律,数值计算结果显示切顶后降低了巷道顶板与煤柱侧应力集中程度,煤柱内部垂直应力降低约36%,水平应力降低约11%,巷道位移量明显降低。通过工业性试验表明,切顶卸压后,110304回风巷顶板、帮部围岩内裂隙发育减少,两帮相对移进量为249 mm,顶底板相对移进量为237 mm,巷道变形得到有效控制,成功将110304回风巷保留下来。该技术可为宋新庄煤矿后续开采提供一定的技术参考。

关键词: 双巷掘进, 采动应力, 密集钻孔, 切顶卸压, 围岩控制, 数值模拟

Abstract: Song Xinzhuang Coal Mine 110303 working face return airway is affected by 110301 working face mining, the roadway shows large deformation characteristics and cannot meet the normal production needs. Therefore, during the mining of the working face of the wing 110302 in the mining area, the roof of the transportation roadway is constructed intensively drilling and cutting top relief technology, so as to optimize the post-mining lateral stress distribution of the 110304 return airway. Combined with the geological conditions of the working face, through theoretical analysis and Flac3D numerical simulation, key technical parameters such as roof cut-ting height, angle and hole spacing were determined, and the stress evolution law of the surrounding rock of the roadway before and after roof cutting was studied. The amount of displacement in the roadway was signif-icantly reduced. Industrial tests have shown that after the top cut and pressure relief, the development of fis-sures in the roof and surrounding rocks of 110304 return airway was reduced, the relative displacement of the two helpers was 249 mm and the relative displacement of the top and bottom plates was 237 mm. This tech-nology can provide some technical reference for subsequent mining in Song Xinzhuang coal mine.

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