穿层钻孔封孔深度与封孔工艺优化研究

Study on Hole Sealing Depth and Hole Sealing Technology Optimization of Through-layer Drilling

为提高穿层钻孔瓦斯抽采效率,以鹤煤中泰矿4201底抽巷瓦斯抽采工程为背景,采用力学模型理论分析与RFPA^(2D)数值模拟相结合的方法,通过对底抽巷围岩的应力变化规律及塑性区分布特征进行研究,确定4201底抽巷穿层钻孔合理封孔深度为8.25 m.对径向强力膨胀法封孔工艺进行优化改进和现场对比试验,结果表明,优化后的封孔工艺比原封孔工艺的平均瓦斯抽采浓度提高0.68倍,证明了穿层钻孔封孔深度的合理性和优化后封孔工艺的有效性。

In order to improve the efficiency of gas extraction by cross-seam drilling,the method of combining mechanical model theory analysis with RFPA^(2D) numerical simulation is adopted in the background of gas extraction project of 4201 bottom roadway in Hemei Zhongtai Mine,based on the study of the stress variation law and the plastic zone distribution characteristics of the surrounding rock of 4201 bottom-pumping roadway,the reasonable sealing depth is 8.25 m.The results show that the optimized hole-sealing technology is 0.68 times higher than the average gas extraction concentration of the original hole-sealing technology,it is proved that the depth of hole sealing is reasonable and the post-sealing technology is effective.