摘要
Abstract
In response to the complex gas occurrence,high gas content,and the risk of coal and gas outbursts in the Jixi mining area,taking the No.14 coal seam working face of Pinggang Coal Mine as the research object,the necessity of gas drainage was demonstrated from the perspectives of ventilation capacity,outburst prevention requirements,and resource utilization of the mining face.The permeability coefficient of this coal seam is low,and the attenuation coefficient of drilling gas flow fluctuates,making direct extraction difficult.By applying enhanced drainage techniques such as hydraulic fracturing and deep hole controlled pre splitting blasting,as well as effective drainage of gas from adjacent layers and goaf areas,the gas extraction efficiency has been significantly improved.By combining cross drilling and high-pressure water jet cutting techniques,the gas extraction efficiency has been improved by over 40%,and the accident rate has been reduced by 60%.This study provides a scientific basis for gas control in low-permeability coal seam groups,which is not only of great significance for the safe production and efficient mining of Pinggang Coal Mine,but also provides technical reference for gas control in similar mining areas.关键词
低透气性/煤层群/瓦斯预抽/高压水射流/预裂爆破Key words
low air permeability/coal seam group/gas pre-drainage/high-pressure water jet/pre-splitting blasting分类
矿业与冶金
