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针对和睦山铁矿破碎倾斜厚矿体双工作面诱导冒落法开采条件,对下位工作面矿岩冒落规律进行了研究。通过建立修正冒落拱力学模型,对冒落拱跨度和高度的关系进行了分析,在现有开采跨度条件下,下位工作面矿体具有良好的可冒性。并对下位工作面开采过程进行数值分析,结果表明,开采跨度直接影响冒落进程,冒落拱高度随开挖跨度的增加而增加。当冒落拱高度达到上盘围岩后,冒落拱沿矿岩界线向下盘方向倾斜,当开挖跨度大于上盘围岩临界冒落跨度时,冒落拱垂直向上盘围岩扩展,模拟结果与现场冒落过程的监测结果相一致。并根据这一规律提出了加速下位工作面上盘围岩冒落的回采顺序和出矿措施,对提高下位工作面的安全性和回采指标具有重要意义。
Aiming at the mining conditions of the caving method induced by the double face of the thick ore body in the fractured slope of the Humushan Iron Mine, the law of the ore - bearing rock falling in the lower working face was studied. The relationship between the span and the height of caving arch is analyzed by establishing a revised mechanics model of caving arch. Under the existing mining span conditions, the ore body of the lower caving face has good foolproofness. The numerical analysis on the mining process of the lower face shows that the mining span directly affects the falling process and the height of the caving arch increases with the increase of the excavation span. When the height of the caving arch reaches the surrounding rock of the hanging wall, the caving arch slopes downwards along the boundary line of the ore rock. When the excavation span is greater than the critical falling span of the surrounding wall of the hanging wall, the caving arch extends vertically to the surrounding rock of the hanging wall, The simulation results are consistent with the monitoring results of the caving process in the field. According to this law, it is put forward that it is of great significance to accelerate the sequence of coal mining and the mine outburst on the upper and lower sides of the caving face, which is of great significance to improve the safety of the lower working face and the recovery targets.