基于FLAC3D的近距离极薄煤层开采数值模拟研究

Study on Numerical Simulation of Short-Distance Extremely Thin Coal Seam Mining Based on FLAC3D

摘要: 通过FLAC3D数值模拟软件模拟研究了近距离倾斜薄煤层开采引起的工作面上覆岩层运移形态规律。得出：工作面回采过程中，工作面顶板受开采卸荷作用的影响，顶板出现垂直向下的卸载膨胀变形，引起顶板的离层、冒落。底板出现垂直向上的卸荷膨胀变形，煤层顶板变形大于底板；随着工作面的不断推进，煤层回采后，工作面前后方出现应力集中现象，随着开采进行，工作面前后方支承应力是移动型支承应力；煤层回采后，地表变形逐渐增大，且最大沉降与煤层倾角有关，约在煤层中部偏采区深部一侧。

Abstract: Through FLAC3D numerical simulation software, the migration pattern of overlying strata in working face caused by mining close inclined thin seam is studied. It is concluded that during the mining process, the roof of the working face is affected by the unloading effect of mining, and the roof undergoes vertical downward unloading expansion deformation, resulting in the roof separa-tion and caving. The floor appears vertical unloading expansion deformation, the deformation of coal seam roof is larger than that of the floor; with the continuous advance of the working face, the stress concentration phenomenon appears behind the working face after coal mining. With the mining proceeding, the supporting stress behind the working face is movable supporting stress; after coal mining, the surface deformation increases gradually, and the maximum settlement is related to the inclination angle of the coal seam, which is about in the coal seam deep side of partial mining area in the middle of stratum.