Analysis of reasonable sealing length and bag pressure sealing technology for high gas mine
To determine the reasonable sealing length for gas extracting boreholes along the seam in Shaanxi Huangling No.2 Coal Mine,a sealing length analysis based on the stress state distribution characteristics of the boreholes is carried out,and the elastic-plastic softening model of roadway is adopted to quantitatively obtain the radius of the post-peak stress increasing zone of gas extracting boreholes under the geological conditions of the mine.The optimal sealing length for the mine is deter-mined to be 12 m by theoretical calculation.The double-bag integrated sealing technology is applied to replace the tradition-al polyurethane material for sealing,and the average gas concentration of pre-extraction boreholes is increased from 14.2％to 30.2％,achieving good gas extraction effect.
gas pre-extractionborehole-sealing lengthborehole stresspost-peak stresspressure grouting
万方数据
维普
