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以海石湾矿山地下开采为背景,借助基于连续介质力学的离散元方法——CDEM数值模拟计算方法,对山区下煤层开采过程中不同采动影响模式下覆岩的移动和破坏进行了模拟分析,并结合相似模拟试验与现场岩移监测所得结果,得到了顺坡推动式采动影响模式及逆坡牵引式采动影响模式下,覆岩的移动和破坏形式,并从数值分析和实际观测上验证了高顺坡开采转低逆坡开采时覆岩悬臂梁结构的存在,解释了坡底局部隆起的现象。研究表明,在相同地质条件下,顺坡开采坡顶易发生张拉及剪切破坏,坡底有剪切蠕滑的可能,因此,较逆坡开采对边坡稳定性影响更大。所以在实际生产中宜将上工业广场建于低矮的坡体较完整的逆坡上。
Based on the underground mining in Haishiwan mine, the movement and destruction of overlying strata under different mining influence modes in the mining process of lower coal seam in mountainous area are simulated with discrete element method based on continuum mechanics - CDEM numerical simulation method Based on the results of similar simulation tests and on-site rock movement monitoring, the movement and failure modes of overburden strata under the mode of slope-driven mining and impact-induced mining are obtained. From numerical analysis and practical observation It verifies the existence of overburden cantilever beam structure when downhill mining is carried out in high smooth slope mining and explains the phenomenon of local uplift on slope bottom. The results show that under the same geological conditions, the slope top is apt to be tensioned and sheared, and the slope bottom has the possibility of shear creep. Therefore, the influence of slope mining on slope stability is greater than that of the reverse slope mining. Therefore, the actual production should be built on the Industrial Plaza in the lower slope of a more complete reverse slope.