Research On The Application Of Multi-frequency Radio Wave Detection In Coal Face

As one of the most commonly used geophysical prospecting methods in large mining areas,radio wave fluoroscopy in mines is widely used to detect various geological structures such as collapse columns,goaf water and faults between coal seams.In order to further explore the relevant applications of radio wave perspective,this paper conducts a systematic study on radio wave multi-frequency perspective from the aspects of theoretical analysis,detection methods,data processing and engineering tests.The research results are as follows:1 Radio wave perspective detection was carried out in the thin coal area and fault area under a variety of frequencies.The field intensity and absorption coefficient of various frequencies obtained were reasonably processed,and the line graph was drawn according to the processing results to analyze the rule of the line graph.2 By comparing and analyzing the treatment results of the fault zone and the thin coal zone,the applicable range of various frequencies and the influence of frequency variation on the physical parameters are summarized.3 Multiple frequencies can be used for radio wave perspective detection on the same working face,which is conducive to determining the appropriate frequency range and the best detection frequency.4 Narrow working face has a larger perspective frequency range,while wide working face only has a relatively low frequency for perspective.5 Various processing methods can be used to reasonably process the collected field intensity data,and the trend of the line graph can be used to analyze the variation characteristics of physical parameters in different abnormal areas at different frequencies,so as to determine the degree of the abnormal areas.6 Normal coal seam,thin coal seam and fault affected area have different multi-frequency detection response characteristics,which may be related to the dispersion effect.7 Inversion imaging results of different frequencies can be obtained by using multi-frequency perspective detection,so as to accurately locate the geological abnormal areas.