Application of 3D Seismic Full-waveform Inversion Technology in Fully Mechanized Coal Mining Face
The identification of coal rock interface is a key link in the intelligent construction of coal mines.To solve this difficulty,the three-dimensional seismic full waveform inversion technology is used as the research basis,and the objective function is established and the optimization method is searched for analysis.A detailed exploration of the coal rock interface of a certain mining face is carried out.Based on the actual seismic data of the working face,through theoretical analysis and practical calculation,a three-dimensional velocity structure model of full waveform inversion in the study area was obtained,and error comparison analysis was conducted with the tunnel exposure situation.The results showed that:1)three-dimens-ional seismic full waveform inversion can be applied in the observation system of underground coal mines,and can accurately reflect the three-dimensional spatial characteristics of the coal seam roof and floor interface.2)Compared to the vertical accuracy of about 5 m for ground 3D seismic data,this method actually reveals calculation errors.The average error of the longitudinal wave velocity model results is about±1.3 m,and the average error of the transverse wave velocity model results is about±1.8 m,indicating a significant improvement in accuracy.3)The three-dimensional longitudinal wave velocity model has a better recognition effect on the coal seam roof and floor interface than the three-dimensional transverse wave velocity results.For the transverse wave results,the average recognition accuracy of the longitudinal wave results is improved by 27.78％.4)By using a three-dimensional longitudinal wave velocity model,the three-dimensional spatial characteristics of the coal seam roof and floor can be ultimately constructed,providing a way to identify the interface between the coal seam roof and floor.
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