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针对近距离、低透气性、极松软突出煤层群区域防突难题,提出了下向穿层钻孔综合水力化防突技术。理论分析了下向穿层钻孔综合水力化防突技术防突机理。模拟了注水润湿前后不同孔径钻孔周围煤体应力分布规律。结果表明:水力冲煤孔径增加,钻孔卸压范围增加;相同孔径,注水软化同时增加卸压范围;增加水力冲煤孔径的卸压效果优于注水软化的卸压效果;卸压影响范围与水力冲煤半径负倒数存在指数函数关系。根据技术原理,研发了下向穿层钻孔综合水力化技术工艺,建立了技术防突效果指标考核体系。该技术在青东煤矿得到成功应用,为该条件下区域防突提供新的技术途径。
Aiming at the problem of preventing sudden collapse in the coal seam group with close distance, low permeability and extremely loose softness, the integrated hydraulic control of outburst is proposed. Theoretical analysis of the outburst prevention mechanism of integrated hydraulic control of outburst under through borehole drilling. The stress distribution of coal around holes with different hole diameters before and after water injection was simulated. The results show that the pore size of hydraulic coal flushing increases and the range of pressure relief for drilling increases. The same pore size and water softening can increase the pressure relief range at the same time. The pressure relief effect of hydraulic coal flushing is better than that of water softening. There is an exponential relationship between the negative countdown of hydraulic coal washing radius. According to the principle of technology, a comprehensive hydraulics technology for drilling down through layers was developed and an index system for evaluating the effect of technology against outburst was established. The technology has been successfully applied in Qingdong Coal Mine, providing a new technical approach for preventing outburst in this area.