Three-dimensional coal seam modeling of fully mechanized working face based on transparent geology

The three-dimensional coal seam modeling method based on transparent geology is an effective way to indirectly solve the problem of coal rock identification. Most of the existing three-dimensional coal seam modeling methods focus on the expression of spatial three-dimensional entities. There is a lack of research on the dynamic change of coal seam roof and floor in the mining process. And the prediction precision of coal seam roof and floor elevation under complex geological conditions is not high, which is difficult to meet the actual needs of coal mining. In order to solve the above problems, this paper proposes a three-dimensional coal seam modeling method of fully mechanized working face based on transparent geology. Based on the geological data of air inlet and return roadway, borehole measurement data, open-off cut data of working face and the coal seam geological data obtained by using three-dimensional seismic re-interpretation technology, in-seam seismic exploration technology and wireless electromagnetic wave perspective technology, the discrete smooth interpolation (DSI) algorithm is applied to predict the elevation of coal seam roof and floor. And the static three-dimensional coal seam model of fully mechanized working face is constructed. In order to improve the precision of the static three-dimensional coal seam model of the working face, the geological information newly revealed by open-off cut and DSI algorithm are used to dynamically update the model to obtain a more accurate dynamic three-dimensional coal seam model of the working face. Based on the updated three-dimensional coal seam model, the cutting curve of the shearer is dynamically planned to guide the shearer to automatically adjust height so as to achieve adaptive coal cutting. The method is applied to 810  fully mechanized working face of Huangling No.1 Coal Mine, the results show that the DSI algorithm is better than Kriging interpolation algorithm and spline function interpolation algorithm in the prediction of coal seam roof and floor elevation. The mean absolute error of interpolation is 0.015 5 m. The three-dimensional coal seam model is updated once every 5 m of cutting, and the elevation prediction error of coal seam roof and floor is ≤ 6.3 cm, which meets the requirements for precise planning of the cutting track of the shearer.