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高位关键层稳定性问题可能引起下伏工作面的动力灾害,而目前主流的煤与瓦斯突出的预测方法无法达到高位岩层的范围。为研究工作面附近应力拱与高位关键层应力变化的关系,以海孜煤矿86采区762工作面开采为例,简化建立煤层走向长壁开采3DEC模型,分析压力拱演化规律,并与微震监测数据对比。研究结果表明,压力拱随着工作面的推进不断扩大,当压力拱范围扩大到在高位关键层层面时,会重新成拱,引起整个压力拱形态的改变。
The problem of high key stratum stability may cause dynamic disasters on the subsurface work face, and the current prediction methods of coal and gas outburst can not reach the range of high stratum. In order to study the relationship between the stress arch and the stress of the key critical layer in the vicinity of working face and taking the mining of No.276 working face in 86 mining area of Haizi Coal Mine as an example, the 3DEC model of longwall mining in coal seam is simplified and the evolution law of pressure arch is analyzed. Data comparison. The results show that as the pressure arch expands with the advancement of the working face, when the pressure arch enlarges to the high key level, the arch will be re-arched, causing the change of the shape of the pressure arch.