和睦山铁矿倾斜厚矿体诱导冒落规律研究

发布时间：2018-07-21 18:38

【摘要】：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。
[Abstract]:In view of the mining conditions of double face induced caving in broken and inclined thick orebodies of Heheshan Iron Mine, the law of rock caving in lower face is studied. The relationship between the span and height of caving arch is analyzed by establishing a modified mechanical model of caving arch. Under the condition of existing mining span, the orebody of lower face has good caving ability. The numerical analysis of the mining process of the lower face shows that the mining span directly affects the caving process and the falling arch height increases with the increase of the excavation span. When the height of the caving arch reaches the upper wall rock, the caving arch inclines along the downward direction of the ore-rock boundary, and when the excavation span is larger than the critical caving span of the upper wall rock, the caving arch extends vertically up the wall rock. The simulation results are consistent with the monitoring results of the field caving process. According to this law, the mining sequence and mining measures of the surrounding rock caving in the upper face of accelerating lower face are put forward, which is of great significance to improve the safety and mining index of the lower face.
【作者单位】：东北大学资源与土木工程学院;
【基金】：国家自然科学基金重点基金项目(51534003);国家自然科学基金青年基金项目(51404065) 中央高校基本科研业务费项目(N150104006)
【分类号】：TD861.1

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