Study of Transient Electromagnetic Detection Technology for Gob Water under Complex Topographic and Geologic Conditions
JIANG Qintao
Abstract：In order to effectively detect the gob water in coal mines with the terrain height difference up to 263 m and the thickness of loess cover up to 55 m, optimum research was carried out on the size of the transmitting antenna frame, the transmitting frequency, the sampling delay time and the transmitting current of the transient electromagnetic method through the contrast test. The contrast and optimal results showed that the size of the transmitting antenna frame was 240 mí240 m, the transmitting frequency was 16 Hz, the sampling delay time was 380 μs and the transmitting current was 15 A, and they were the parameters most suitable for the detecting area. In the actual detection, 60 detecting lines were laid out with the line spacing of 40 m and the point spacing of 20 m, and 27 TEM transmitting loop frames were used. In order to eliminate the impact of the interference signals and the topographic change, the filter was first used to eliminate the noise and then the deep conversion was adopted to remove the impact of the topographic change during data processing. Data interpretation showed that in the detection area, there were 2 larger water zones in No. 9 seam and 3 water zones in No. 15 seam, with water area of about 891 884 m2 and water of about 149 090 m3.
Keywords：mining area with complex topographygob watertransient electromagnetic methodtechnical parameter
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 57-60 )