松软低透煤层卸压增透后封孔技术研究

Study on sealing technology of soft and low permeability coal seam after pressure relief and reflection improvement

为解决白坪煤矿二1煤层瓦斯抽放钻孔封孔难度大、瓦斯抽采浓度较低、衰减快、含有CO等问题,保证抽采质量,对矿井地质条件进行分析,计算底板穿层治理和本煤层巷道掘进对巷道煤体产生的破坏范围,结合生产时间和现场试验确定封孔位置和封孔长度;为解决注浆孔堵孔的问题,提出反压注浆法。现场实践证明,通过对注浆工艺的优化和反压注浆法的实施,单孔瓦斯初始浓度达到80%、主抽放管路瓦斯浓度达到30%。

in order to solve Bai Ping二1 coal seam of coal mine gas drainage borehole drilling hole sealing is difficult,the concentration of the gas extraction such problems as low,fast attenuation,contains CO,ensure the quality of extraction,analysis of the mine geological conditions,to determine the bottom layer of governance and coal seam roadway drivage of coal roadway damage range,combined with the production time and the field test to determine the hole sealing position and hole sealing length;In order to solve the problem of plugging the grouting hole,the reverse pressure grouting method is put forward.Field practice has proved that through the optimization of the grouting process and the implementation of the reverse pressure grouting method,the initial concentration of gas in the single hole can reach 80%and the concentration of gas in the main drainage pipeline can reach 30%.