Lu'an Chemical Group Sijiazhuang Co. ,Ltd.

针对寺家庄矿走向长度3300m的大采长工作面煤层瓦斯储量和涌出量大、上隅角容易超限的难题,采用大直径顺层钻孔抽采煤层瓦斯技术,建立了考虑钻孔叠加效应的流固耦合数值计算模型,分析了钻孔直径分别为113mm和400mm时钻孔抽采的瓦斯压力演化规律、有效抽采半径以及瓦斯抽采效果。研究结果表明:实施大直径钻孔预抽技术后,钻孔有效抽采半径相对于普通直径钻孔提高了21.12%;引入系数k=pm/pc作为叠加效应的评判指标,以单孔直径113mm钻孔有效抽采半径为参考,采用普通直径钻孔进行多孔抽采时,直径113mm钻孔有效半径较单孔抽采提升了3.7倍;采用大直径钻孔进行多孔抽采时,其有效半径较单孔抽采提升了4.5倍;钻孔瓦斯抽采浓度提高了2倍,抽采纯量提高了5倍,为大采长工作面的瓦斯治理和安全生产提供了技术和理论指导。

The large quarry face with a strike length of m in Sijiazhuang Mine features high gas reserve,large gas outflow and its upper corner is easy to exceed the limit. This study adopts the gas management technology of extracting the gas from the coal seam by drilling large-diameter downhole holes. We established a numerical model of fluid-solid coupling by considering the superposition effect of drill holes to analyze the evolution of gas pressure,effective extraction radius,and the effect of gas ex- traction when the diameter of drill holes is mm and mm respectively. The results show that ①after implementing pre-extraction technology in the large diameter drill hole,the effective extraction radius of the drill hole increased by 21. 12% ;②When introducing the coefficient k = p / p as a judg- ment index of the superposition effect,taking the effective extraction radius of a single mm diameter drill hole as a reference,the effective radius of a mm diameter drill hole is improved by 3. 7 times compared with that of a single hole when using a common diameter drill hole for multi-hole extraction; ③The concentration of the gas extracted from the drill hole increased by times,and the pure amount of extraction increased by times,which provides technical and theoretical references for the gas man- OF MINING SCIENCE AND TECHNOLOGY agement and safe production of the working face of large mining fields.

河南省科技公关(222102320142,242102321166)

谢俊.大直径钻孔预抽瓦斯治理技术研究[J].矿业科学学报,2024,9(4):529-537,652.

XIE Jun. Research on pre-pumping gas control technology for large-diameter borehole[J]. Journal of Mining Science and Technology,2024,9(4):529-537,652.