The 4th International Symposium on Mine Safety Science and Engineering (ISMSSE2018)

319 / 2018-05-04 14:13:38

Fine detection technology of gas outburst area based on direct current method in the Zhuxianzhuang coal mine, China

DC method; coal and gas outburst; resistivity; fine; anomaly area

Gas of Coal Mine & Coal and Gas Outburst > Coal and gas outburst

In this paper, with No.Ⅱ1051 working face of Zhuxianzhuang coal mine taken as the research object, the electric characteristics of coal samples were tested in the laboratory, and resistivity imaging was made on the working surface via direct current (DC) prospecting instrument in site. Fine division was performed on outburst danger areas in combination with gas geological analysis, in addition to mining verification and analysis. The results suggest that variation laws of electrical characteristics of samples are in good correspondence with site detection. Inhomogeneous distribution of resistance on the working face, such as regional significant high and low resistance, is induced by the combined effect of gas, stress, structure and water. Based on aforesaid analyses, five outburst areas are determined, including high- and low-resistance regions and the mixed zone. Gas occurrence regularity proves that the result of DC prospecting can reflect distribution of outburst danger areas, which is of great importance to realize fine detection of gas outburst.