【摘 要】
：
According to the specific geological condition, analyzed the stress distribution of the overlying strata, the displacement of pressure released seam, thickness variation and the distribution of plastic zones by FLAC3D software to simulate mining of the lo
【机 构】
：
College of Resources and Safety Engineering, China University of Mining & Technology(Beijing), Beiji
论文部分内容阅读
According to the specific geological condition, analyzed the stress distribution of the overlying strata, the displacement of pressure released seam, thickness variation and the distribution of plastic zones by FLAC3D software to simulate mining of the long-distance lower protective seam. The research results show that the distribution of vertical stress appears as a “Double-hump” within the pressure-relief range of the protected coal seam and the swelling deformation curve of coal bodies takes an “M” shape. The swelling is divided into initial swelling, swelling increase and swelling compression stability. The maximum swelling ratio of the pressure released seam is 1.84%, protection angle of the lower protective coal seam along the strike direction is about 55°, protection angle below the dip direction is about 50°, protection angle above the dip direction is about 55°, and the coal seam compression zone resembles a “U” shape.
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