摘要
为了探究梅花井煤矿2~#煤采空区覆岩变形破坏规律及导水裂隙带高度,利用FLAC~(3D)建立了数值模型,分别对开采50~400 m的各阶段进行了模拟。结果表明:顶板岩层变形破坏形态一般呈马鞍形;顶板附近岩层若存在微裂隙,裂隙两端就会出现应力集中现象,此类区域内的岩石很容易发生跨落。2~#煤顶板导水裂隙带最大发育高度值约为73 m。研究结果对2~#煤的安全开采提供了重要依据。
In order to study overlying strata deformation-failure law induced by No.2 coal excavation, the numerical model was established by FLAC~(3 D) software. Simulation process shows that overlying strata failure is usually in the form of a saddle with high stress concentration on both sides and low in the middle. If there are micro-cracks in the rocks near the roof, two constraint ends are most likely to emerge failure for the maximum stress. The height of the water flowing fractured zone is about 73 m. Those results provide rational and feasible reference for coal mining.
引文
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