Design of Gas Extraction Drilling Hole and Analysis of Gas Extraction Effect in 15#Coal Seam of Shigang Coal Industry Co.,Ltd.
Shigang Coal Industry Co.,Ltd.is a prominent mine with a relatively high gas content in 15#coal seam.In order to solve the gas problem in 15#coal seam,a comprehensive analysis of the basic gas situation in 15#coal seam was conducted,and measures for gas pre-extraction were formulated.Corresponding measures were taken for roadway excavation and working face recovery,with a pre-extraction control range of 15 m on both sides of the roadway contour line and a hole spacing of 4 m;the spacing between pre-drilled holes at the working face was 2 m,and the extraction radius was 1 m.Through post production performance evaluation,the standard pre-extraction period of 15107 working face was 180 d,and the pre-extraction drilling through the layers had a good effect on the extraction of the excavation roadway.
outburst minesgas pre-extractiondrilling through layershorizontal drillingeffect assessment
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维普
