摘要
针对汾源煤业5号煤层厚度大、综放工作面顶煤回收率不理想的问题,计划采用水力压裂的方法对顶煤进行弱化。首先采用理论分析、数值模拟的方法,确定了合理的水力压裂孔孔径为60 mm、孔间距为10 m。在5-104轨道巷及皮带巷布置扇形压裂孔,其中压裂孔A孔深10 m,与水平方向夹角为70°;压裂孔B孔深50 m,与水平方向夹角为5°。现场试验结果表明,对顶煤进行水力压裂后,顶煤块度明显减小且顶煤回收率得到显著提升。
In view of the problem that the thickness of No.5 coal seam in Fenyuan Coal Mine is large and the top-coal recovery rate in the fully-mechanized caving face is not ideal,it is planned to adopt the method of hydraulic fracturing to weaken the top-coal.Through theoretical analysis and numerical simulation,a reasonable aperture of the hydraulic fracturing hole is determined to be 60 mm,and the hole spacing is 10 m.Fan-shaped fracturing holes are arranged in the 5-104 track roadway and belt roadway.Among them,the depth of fracturing hole A is 10 m,and the angle with the horizontal direction is 70°.The depth of fracturing hole B is 50 m,and the angle with the horizontal direction is 5°.The results of on-site tests show that after hydraulic fracturing of the top-coal,the lump size of the top-coal is significantly reduced,and the top-coal recovery rate is significantly increased.
作者
李增禄
Li Zenglu(Shanxi Coking Coal Huozhou Coal Eletricity Fenyuan Coal Industry Co.,Ltd.,Huozhou Shanxi 035107,China)
出处
《山西冶金》
2025年第7期235-237,共3页
Shanxi Metallurgy
关键词
厚煤层
综放工作面
水力压裂
顶煤弱化
thick coal seam
caving working face
hydraulic fracturing
weakening of top coal
