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丰沛矿区三河尖南风井,在垂深378.05米至403.81米处,为一层厚25.76米中粒砂岩,裂隙发育,含水丰富,渗透系数为0.1878米/昼夜,预计井筒穿过该含水层时最大涌水量为83吨/时,静水压力为40.6公斤/厘米~2。井筒用普通法施工困难很大。为加快井筒施工速度,改善工人劳动条件,提高井壁质量,降低工程造价,通过多次的方案对比和调查研究,确定采用工作面预注浆封水的施工方法。
Fengbei mining area Sanhe tip southerly wells, at a depth of 378.05 meters to 403.81 meters, a layer of 25.76 meters of medium sandstone, the development of fractures, rich in water, permeability coefficient of 0.1878 m / day and night is expected when the wellbore through the aquifer The maximum water inflow is 83 tons / hour, hydrostatic pressure is 40.6 kg / cm ~ 2. Wellbore construction with common law is very difficult. In order to speed up the construction speed of wellbore, improve the working conditions of workers, improve the quality of the shaft wall and reduce the construction cost, through the comparison and investigation of many schemes, the construction method of using pre-grouting and sealing water in the working face is determined.