关键词: 开采速度, 过沟开采, 覆岩破坏, 数值模拟, 浅埋煤层

Abstract: In order to study the influence of ditch mining speed on the movement and deformation of the overlying strata in shallow coal seams, the Anshan mine field in the Miaohagou mining area in northern Shaanxi was taken as the research object, and the ditch model was established using Rhino3D-FLAC3D coupling technology. The 6m/d and 8m/d advancing speeds are numerically simulated, and the influence of different mining speeds on the deformation of the overburden was discussed. Research shows that: when the coal seam is excavated at a speed of 4m/d, The height of the water-conducting fissure zone, the surface subsidence value and the horizontal movement value are 42.2m, 1.67m and 0.2m respectively; When the coal seam is excavated at a speed of 8m/d, the height of the water-conducting fissure zone, the ground subsidence value and the horizontal movement value are 32m, 1.01m and 0.14m, respectively, Compared with mining at a speed of 4m/d, the height of the water-conducting fissure zone, the value of ground subsidence and the value of horizontal movement have been reduced by 24%, 40% and 31%, respectively. As the mining speed increases, the amount of overburden movement and deformation decreases. Therefore, in order to reduce the amount of movement and deformation of the overlying rock during the mining process, in the coal mining process, the coal seam advance speed can be appropriately increased according to the actual situation.