Study On Radio Wave Perspective Of Coal Face In Coal Mining Face Of Zhangji Mine

Radio wave perspective detection has high efficiency and low cost,which is the most commonly used method for geological structure exploration in working face.Through theoretical analysis and field data processing,this paper systematically studies the perspective of the main coal seam in Zhangji Coal Mine,Huainan Mining Area.The main conclusions are as follows:(1)6 coal face adopts 0.5MHz working frequency,electromagnetic wave absorption coefficient of coal seam is 0.031-0.046dB/m,effective perspective distance is 210m;0.3MHz working frequency is adopted,coal seam absorption coefficient is 0.018-0.036 dB/m,effective perspective distance is 258 m.The coal seam has good electromagnetic wave penetration,and the maximum width of working face suitable for exploration is 258 m.(2)8 coal face adopts 0.365 MHz working frequency,electromagnetic wave absorption coefficient of coal seam is 0.006-0.034 dB/m,effective perspective distance is 248-275 m.The coal seam has good electromagnetic wave penetration,and the maximum width of working face suitable for exploration is 248 m.(3)11-2 coal face adopts 0.3-0.365 MHz working frequency,the electromagnetic wave absorption coefficient of coal seam is 0.009-0.033 dB/m,and the effective perspective distance is 250-265 m.The coal seam has good electromagnetic wave penetration,and the maximum width of working face suitable for exploration is 250 m.(4)13-1 coal face adopts 0.3-0.365 MHz working frequency,the electromagnetic wave absorption coefficient of coal seam is 0.015~0.034 dB/m,and the effective perspective distance is 255-298 m.The coal seam has good electromagnetic wave penetration,and the maximum width of working face suitable for exploration is 255 m.(5)The comparative analysis of apparent resistivity of roof and floor of different coal seams shows that when the ratio of apparent resistivity of coal seam to apparent resistivity of roof and floor rock is low,the radio wave absorption coefficient is higher and the effective perspective distance is smaller;when the ratio is high,the absorption coefficient is lower and the effective perspective distance is larger.(6)The influence analysis of different coal thickness shows that there is a negative correlation between coal thickness and electromagnetic wave absorption coefficient of coal seam.The bigger the coal thickness is,the smaller the electromagnetic wave absorption coefficient is.Figure [35] table [10] reference [85]...