Application of high level drilling in gas control in Huangbaici Coal Mine
Taking the No.020913 fully-mechanized mining face of Huangbaici Coal Mine as the research object,by analyzing the source of gas emission in the goaf of the close range coal seam group and the distribution pattern of mining induced overlying rock fracture field,targeted high level drilling was selected as the main measure for gas control in the working face.Through theoretical calculations,the parameters for the arrangement of high level drilling were obtained preliminarily.In order to further obtain the optimal layout param-eters of high level drilling,the optimal layout layer of high level drilling in the No.020913 fully-mechanized mining face was obtained by comparing and analyzing the variation patterns of high level drilling extraction concentration in different layers and based on on-site in-spection results.The on-site practice results show that the optimal effect of arranging high level drilling for extraction is at a distance of 25 m from the coal seam roof.After using high level drilling for extraction,the maximum gas concentration in the return air flow during the extraction period of the No.020913 working face is 0.52％,and the gas concentration in the upper corner does not exceed 0.6％,achieving the expected gas control effect and effectively ensuring the safety production of the mine.
high gas mineclose distance coal seam grouphigh level drillinggas control
万方数据
维普
