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中文摘要：
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煤层开采时工作面项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，发现对于龙回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。
英文摘要：
In connection with the geological conditions of mining concluding large mining depth and long span in 1301N working surface in Longgu coal field, the vertical stress and plastic zone distribution in the roof of working face when exploiting No. 3 coal seam were analyzed by using three- dimensional software Flac3D, and numerical simulation of developing height of fractured zone was carried out, it was found that when the advance length of working face was up to 140 m the fracture zone went through from a step-by-step process to a full and speedy development,so the work- ing face span of 140 m is a critical point. Meanwhile, with the comparisons of results of Flac3D simulation, simulated height of RFPA and actual development height of fracture zone,a conclusion can he found that the results of Flac3D simulation are closer to the reality than that of RFPA simulation, and the average error is small, so Flac3D simulation has greater application value on safe production in Longgu coal field and other coal fields.
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North China Lower Coal Surrounding Rock Failure Characteristics Study Based on FLAC3D and Fiber Brag
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