中文摘要：

结合东荣二矿17^#煤层顶板实际情况，运用Flac^2D数值模拟软件对巷道开挖进行模拟分析，研究水渗流对巷道顶板围岩的弱化影响。研究结果表明，薄层复合顶板围岩在渗水后结构自承能力迅速下降，巷道变形速度逐渐加快，最终引发薄层复合顶板离层冒落。研究结论对该矿及类似开采条件的矿井顶板支护及事故预防有重要的理论指导意义。

英文摘要：

Combined with 17^# roof of Dongrong 2nd mine, the numerical simulation software of Flac2D is used to analyze the excavation of roadway, research on weaken influence of water seepage on thin-layer compound roof. The conclusions are as follow：bearing mechanical properties of rock mass structure of thin-layer compound roof have reduced quikly after the water seepage, the deformation speed of the roadway keeps up, eventually lead to thin-layer compound roof take fell and separation caving. It is of important role for the roof support program and accident prevention for this and other mine＇ s roof like Dongrong 2nd mine.