关键词: 松软煤层, 抽采钻孔, 封孔深度, 带压注浆, 封孔工艺

Abstract: There are many problems in gas drainage of soft bedding seam, such as shallow sealing depth, tight sealing hole and so on, leading to poor pumping effect. In view of the above problems, through analyzing the drilling stability and stress field of surrounding soft coal seam, the reasonable sealing depth of grouting hole sealing in soft coal seam is determined. By increasing borehole pressure to the hole wall, sealing filling fissure effectively, the paper puts forward the application of grouting technology in the soft coal seam. By applying in Baoan coal mine, during the 60 days inspection period, the average gas concentration of test hole was increased more than 30%, then the extraction effect and the seam sealing in soft coal seam is greatly improved.