According to Article 153 of Coal Mine Safety Regulations,which stipulates that the intake and return air of the mining face shall not pass through the goaf or roof caving area,the gas extraction technology of 3910 fully mechanized mining face with large mining height(4.5 m)of the 9#coal seam of Zhaiyadi Coal Industry Co.,Ltd.successfully tested by using large-diameter boreholes to replace the gas extraction technology of the connecting roadway goaf.On-site test data shows that gas extraction through large-diameter boreholes provides strong technical support for safe and efficient production in high gas mines,effectively solving the problem of gas exceeding the limit in the upper corner.
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