煤炭工程 ›› 2022, Vol. 54 ›› Issue (7): 44-49.doi: 10.11799/ce202207009

• 施工技术 • 上一篇    下一篇

密集抽采钻孔及浸水蠕变作用下底抽巷围岩控制技术研究

李高健,韦金龙,杨竹军,赵宝友   

  1. 1. 山西长平煤业有限责任公司
    2. 山西晋煤集团长平煤业有限公司
    3. 辽宁工程技术大学
  • 收稿日期:2022-03-04 修回日期:2022-03-24 出版日期:2022-07-15 发布日期:2022-07-20
  • 通讯作者: 李高健 E-mail:LGJ15203569131@163.com

Surrounding rock control technology of floor gas drainage roadway under the action of dense drainage boreholes and water immersion creep

Li Gaojianwei jinlong2,q 11   

  • Received:2022-03-04 Revised:2022-03-24 Online:2022-07-15 Published:2022-07-20
  • Contact: Li Gaojian E-mail:LGJ15203569131@163.com

摘要: 针对长平矿底抽巷变形大、服役期短和存在潜在冒顶风险等问题,提出了“型钢预应力注浆锚索网喷”综合控制技术。采用现场测试、室内实验方法,明确了底抽巷泥岩的结构特性和强度特性,揭示了裂隙化泥岩底抽巷的失稳机制,基于数值模拟和现场试验结果验证了所提围岩综合控制技术的有效性。结果表明:长平矿3号煤底抽巷泥岩具有结构裂隙化、强度低、易风化、浸水软化、蠕变特性显著的特征|以预应力注浆锚索为核心的“型钢预应力注浆锚索网喷”综合控制技术可较好地控制密集抽采钻孔和浸水软化蠕变耦合扰动下裂隙化泥岩底抽巷的围岩变形,使得底抽巷长期安全服役,有效解决了长平煤矿穿层瓦斯治理和采掘接续紧张问题,保障了工作面的安全高效回采。

关键词: 煤矿瓦斯, 底抽巷, 密集钻孔, 浸水蠕变, 围岩控制, 瓦斯抽采

Abstract: In view of the characteristics of Changping coal mine bottom drainage with large deformation, short service life and potential roof collapse, the comprehensive control technology of "steel prestressed grouting anchor cable net shotcrete" is put forward. By field test and laboratory test, the structural and strength characteristics of mudstone in bottom drainage were clarified, and the instability mechanism of fractured mudstone in bottom drainage was revealed. The effectiveness of the proposed comprehensive control technology was verified based on numerical simulation and field test results. The results show that the mudstone of No.3 coal floor drainage tunnel in Changping coal mine has the characteristics of structural fissure, low strength, easy weathering, water softening and remarkable creep characteristics. The deformation of floor drainage roadway induced by dense boreholes and water immersion creep can be well controlled by the presented surrounding rock control technology, which ensures the safe and efficient mining.

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