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

Abstract

In order to study the response characteristics of re ected trough in-seam wave in fault bearing coal seam, nd out the geological structure of coal mine, and ensure the scienti c 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 eld forward modeling of elastic wave equation was carried out by using the nite 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 1m, 3m, 5m and 8m; The dispersion curve of re ected 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 oor, but not to the indirect roof and oor; When the wave velocity difference between the roof and oor is large, the better dispersion response of Airy phase.

Research on the Deformation Law and Stress Distribution Characteristics of Overburden under the Influence of Multiple Faults

“…Chen et al [28] utilized numerical simulation to obtain the range of fault dip angles that can easily cause fault activation, as well as the nexus between fault drop and water inrush disasters. Zhang et al [29] obtained the mechanical parameters of the rock samples through indoor experiments and used numerical models to analyze the relationship between coal seam thickness and wave shape, as well as several factors affecting wave formation. Wang et al [30] identified several main factors leading to roadway instability through research on mine monitoring data and examples, and a new support scheme was proposed based on adherence to the support principles, which was verified through on-site testing afterward.…”