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采用FLAC~(3D)数值模拟软件建立了大同矿区煤层群开采的数值模型,模拟研究了煤层群开采时覆岩导水断裂带的发育过程,分析了3-5~#煤层导水断裂带发育高度与煤厚、工作面长度的关系。模拟结果显示:坚硬顶板下近距离煤层群下行开采,随采动次数增加覆岩导水断裂带高度增加的幅度逐渐减小;随煤层厚度的增加,3-5~#煤导水断裂带高度增加,当煤厚>13 m时,其增幅变大;随工作面长度的增加,3-5#煤导水断裂带高度增加,当工作面长度>190 m时,导水断裂带增幅减小;煤厚为15 m时,将工作面长度缩短至180 m时可确保3-5~#煤的导水断裂不与15#煤采空区贯通。
The numerical model of coal seam group mining in Datong mine was established by using FLAC 3D numerical simulation software to simulate the development process of overlying water conduction fault zone in coal seam group mining. Height and coal thickness, the relationship between the length of the face. The simulation results show that the coal seam group with lower distance under hard roof descends, and the height of overlying strata decreases with the increase of mining times. With the increase of coal seam thickness, the height of 3-5 ~ Increase with coal seam thickness> 13 m, and increase with the increase of working face length. The height of 3-5 # coal water conduction fault zone increases. When the working face length is> 190 m, the increase of water conduction fault zone decreases ; When the coal thickness is 15 m, shortening the working face length to 180 m can ensure that the water-bearing faults of 3-5 ~ # coal will not penetrate through the gob of 15 # coal.