坚硬顶板煤层群开采导水断裂带发育高度模拟研究
Numerical Simulation on Height of Water Flowing Fractured Zone Development in Overlying Rocks Under Hard Roof Coal Seam Group Mining
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摘要: 采用FLAC3D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。Abstract: Numerical model for coal seam group mining in Datong Mining Area was built by using the software FLAC3D, the fractures development during mining process in coal seam group were numerically studied, the development laws of the failures with thickness and face length of 3-5# coal seam was analyzed. The results show that, with the increase of coal seam mining, the increase of fracture development trend declined; the height of fracture increases with the increasing of thickness of 3-5# coal seam; when the coal thickness is greater than 13 m, the fracture height increases quickly; the height of fracture zone increases the face length. When the face length is larger than 190 m, the increase of fracture development trend declined; when the coal thickness is 15 m, the working surface length shortened to 180 m, which can make sure that the fracture zone of 3-5# coal seam and the goaf of 15# coal seam are not related.
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