Study on In-seam Wave Response Characteristics of Reflection in Fault Bearing Coal Seam of Shuangliu Coal Mine

In order to study the response characteristics of reflected trough in-seam wave in fault bearing coal seam, find out the geological structure of coal mine, and ensure the scientific and safe mining of coal mine, the physical property parameters of coal and rock samples of No.3 Coal Seam in Shuangliu Coal Mine were determined, and the three-dimensional numerical analysis model of homogeneous isotropic medium was established. The full wave field forward modeling of elastic wave equation was carried out by using the finite difference method. In this paper, the dispersion curve of No.3 Coal Seam in-seam wave detection in Shuangliu Coal Mine is studied. The results show that under the geological conditions of Shuangliu Coal Mine, the dispersion curves of in-seam wave are obviously different when the coal thickness is 1 m, 3 m, 5 m and 8 m; The dispersion curve of reflected in-seam wave in goaf is disordered, which is obviously different from that of normal coal; The Airy phase velocity of in-seam wave in No.3 coal seam of Shuangliu Coal Mine is about 100 0 m/s, and the dominant frequency is 140 Hz. The conclusions are as follows: the formation of in-seam wave in the mining area is related to the direct roof and floor, but not to the indirect roof and floor; when the wave velocity difference between the roof and floor is large, the better dispersion response of Airy phase.