厚硬岩层下顶煤冒放性分析
首发时间:2005-07-14
摘要:顶煤的运移与垮落,尤其是内部微观裂隙的扩展,与其直接顶和老顶岩层的活动规律密切相关。针对某一厚硬岩层既是上层煤的底板,又直接是下层煤顶板的实际情况,采用数值计算与物理模拟相结合的研究方法,分析清楚了厚硬岩层的破断特征。在此基础上,提出了9种上层煤与下层煤不同开采方案,系统分析了下层煤顶煤压缩量的变化,并确定出上层煤与下层煤工作面交错的合理布置方式,为下层煤推广综放开采工艺提供了设计指导。
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ANALYSIS ON FALLING ABILITY OF TOP COAL UNDER THE HARD-AND-THICK STRATA
Abstract:The movement and breakage of top coal,especially its internal micro-fracture extension,is closely clearly related to the movement regularity of its immediate roof and main roof. To analyze the breakage features of the hard-and-thick strata,which acts both as the floor of the upper coal seam and as the roof of the lower coal seam, numerical simulation and physical simulation are combined used. Based on this, nine mining projects are put forward for the upper and the lower coal seams mining, and the corresponding top-coal compressed volume of the lower coal seam is studied in detail. at last, the rational mining method is determined as the staggered layout of coalface in the upper and the lower coal seam, which ensures successfully the use of the fully-mechanized coalface with top –coal caving in the lower coal seam.
Keywords: hard-and-thick strata falling ability compressed volume staggered layout
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