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针对龙固井田1301N工作面大采深、大跨度的回采地质条件,采用三维数值模拟软件Flac3D,分析了3煤层开采时工作面顶板的垂直应力及塑性区分布等特征,对其导水裂隙带发育高度进行了模拟研究,发现140m工作面跨度是导水裂隙带从缓慢发育、循序渐进向充分、快速发育的分界点;将Flac3D模拟结果与RFPA软件模拟的高度、实测高度比较、分析,发现对于龙固井田及与其类似地质条件的井田,Flac3D比RFPA模拟的结果更贴近实际,且平均误差小,在矿井安全生产中具有较大的应用价值。
According to the geological conditions of deep mining and long-span mining in Longgu minefield, three-dimensional numerical simulation software Flac3D was used to analyze the vertical stress and plastic zone distribution of working face roof during the mining of No.3 coal seam. It is found that the span of 140m working face is the demarcation point of the water-conducting fractured zone from slow development to gradual and rapid development. By comparing and analyzing the results of Flac3D simulation with those of RFPA software, it is found that for the The Longcai Minefield and its similar geological conditions, the Flac3D is more realistic than the RFPA simulation results, and the average error is small, so it has great application value in mine safety production.