Changes in coal seam thickness will affect coal mining deployment and production planning, resulting in increased excavation rate and reduced recovery rate. When normal mining encounters loss of coal seam thickness, thinning, and bifurcation, it will cause local unminable area loss, increase the gangue content of coal mining, and reduce coal quality. Therefore, if we can understand and master the thickness of the coal seam and its changing law before the coal mine is mined, we can provide a strong geological guarantee for the coal mine and improve the economic benefits of the enterprise. The coal seam thickness detection technology via transmission seismic waves exploration, innovated by CCTEG Xi 'an Research Institute (Group) Co., Ltd, is essentially to detect the distribution of sand bodies developed in the coal seam. The distribution of the thinning zone in the coal seam is irregular, but compared with the surrounding rock, the coal seam has the characteristics of low elastic wave propagation speed and low density, that is, low wave impedance. When the channel wave propagates in the coal seam and encounters the sand body boundary of the scoured zone, the amplitude, velocity and other factors of the transmitted channel wave signal will change. The prediction of coal seam thickness by transmission channel wave is to use the detectors arranged on the borehole, well wall, roadway or working face cutout to receive these transmitted channel wave signals, identify and analyze them, and then predict the change of coal seam thickness in the entire working face Using CT imaging technology combined with channel wave dispersion characteristics and roadway exposed coal seam thickness, the quantitative prediction of coal seam thickness in the working face can be realized.
