急倾斜煤层水平分段综放开采覆岩运移规律研究

Research on overlying strata movement during horizontal section top-coal caving in steep and extra-thick coal seam

基于急倾斜煤层水平分段综放开采时,顶板垮落所产生的冲击动量对工作面造成冲击,采用立体相似模拟实验建立相似模型,通过理论分析计算冲击动量,运用3DEC数值模拟对人工爆破强制放顶进行模拟分析。结果表明:在开采初期,采用人工爆破放顶的措施可以减小顶板的悬露面积,顶板垮落后的覆浮矸形成垫层对下分段的生产起到良好的保护作用,降低了冒顶的风险,可有效提高工作面的安全性。

Based on the great impact of roof caving on working face, during horizontal section top-coal caving in steep coal seam, a similar model was established with three-dimensional similar simulation test. The impact momentum was calculated based on theoretical analysis, and the blasting forced roof caving was simulated with 3DEC. Results showed that in the initial stage of production, the blasting caving reduced the roof hanging area; after roof caving, a cushion was formed which protected the lower section, reduced the risk of roof falling, and improved the safety of working face.