Gas control technology and application of"replacing roadways with holes"in complex coal and rock layers of Liangbei Coal Mine
Gas control is an important work for mine safety production and a key means to ensure coal mine safety.Liangbei Coal Mine is a high-outburst mine with complex gas occurrence conditions and geological structures.The gas risk evolution is complex and there are many influencing factors,making disaster prevention and control extremely difficult.In order to improve the gas prevention and con-trol level of Liangbei Coal Mine,this paper proposed a gas control technology of"holes instead of roadways"in complex coal rock stra-ta.This technology is based on the vertical"three-zone"distribution characteristics of the coal seam roof and the numerical simulation analysis results of extraction.It uses directional drilling machines to design and construct directional high-level boreholes in the No.32021 working face to extract gas from the upper corners of the working face and goaf.The extraction results showed that the gas concen-tration in the upper corner of the mining face decreased from the original 0.8％～1.0％to below 0.1％.The concentration of gas ex-traction from boreholes was 28.16％～43.76％,with an average of 35.65％.The pure gas extraction amount was 5.26～7.28 m3/min.This technology has significantly improved the level of mine gas control and saved a lot of anti outburst costs.The research results can provide certain reference significance for other similar mine gas control.
gas control"three-zone"distributionextraction concentration
万方数据
维普
