程潮铁矿西区崩落法转充填法过渡段开采方法研究

发布时间：2018-02-15 09:30

本文关键词： 过渡段开采安全矿柱稳定性相离度-灰色关联分析崩落-充填联合采矿法　出处：《武汉科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：崩落法开采导致程潮铁矿地表大范围塌陷，塌陷区随开采深度增加而扩大，程潮铁矿后期拟采用充填法替代崩落法开采西区矿体，以减小开采对矿区地表环境的影响。为保证崩落法顺利向充填法转型，在崩落法和充填法回采区之间设置过渡段。过渡段占有大量的矿石，本文采用理论分析、数值模拟等方法研究安全、高效回采过渡段矿石的开采方法，并通过程潮铁矿试验采区生产检验开采方法实用性。（1）通过分析过渡段开采条件，确定过渡段回采顺序，并将过渡段划分为安全矿柱和充填采区，其中安全矿柱包括水平安全矿柱和垂直安全矿柱。回采时，先回采充填采区，再回采水平安全矿柱，最后回采垂直安全矿柱。（2）根据过渡段开采条件，确定采用崩落-充填联合采矿法对过渡段进行开采。过渡段水平安全矿柱沿用无底柱分段崩落法回采；垂直安全矿柱采用上向进路充填法回采；根据过渡段充填采区开采条件，，确定上向水平分层充填法、上向进路充填法、分段空场嗣后充填法为充填采区备选开采方法。选取经济和技术方面的8个主要因素作为评价指标，采用相离度-灰色关联分析法对三种备选方法进行优选，确定过渡段充填开采区最佳开采方法为分段空场嗣后充填法。（3）分析安全矿柱的稳定性，确定安全矿柱的尺寸。采用量纲分析法建立过渡段水平安全矿柱稳定性评价模型，并采用数值模拟分析程潮铁矿过渡段水平安全矿柱稳定性，将数值模拟结果应用于评价模型，确定程潮铁矿水平安全矿柱厚度为17.5m；采用数值模拟分析过渡段垂直安全矿柱顶部宽度与其稳定性的关系，确定程潮铁矿垂直安全矿柱顶部宽度取值为25m。（4）将过渡段开采方法在程潮铁矿西区5-1采区进行生产试验，试验结果表明，试验中过渡段安全矿柱未失稳，过渡段矿石回收充分。
[Abstract]:Caving mining results in a large area collapse of Chengchao Iron Mine, and the subsidence area expands with the increase of mining depth. In the late stage of Chengchao Iron Mine, filling method is to be used instead of caving method to exploit the orebody in the western region. In order to reduce the influence of mining on the surface environment of mining area, in order to ensure the smooth transition from caving method to filling method, a transitional section is set up between caving method and filling method return mining area. The transition section occupies a large amount of ore. Numerical simulation and other methods are used to study the method of ore mining in the transition section of safe and high efficiency mining, and to verify the practicability of the mining method in the test mining area of tidal iron ore during the course of mining. 1) by analyzing the mining conditions of the transitional section, determining the recovery sequence of the transitional section, and dividing the transitional section into safe pillar and filling mining area, in which the safe pillar includes horizontal safe pillar and vertical safe pillar. The horizontal safe pillar is mined again, and the vertical safe pillar is finally mined. (2) according to the mining conditions of the transitional section, the combined caving and filling mining method is adopted to mine the transitional section. The horizontal safe pillar of the transitional section is recovered by sublevel caving method without bottom pillar, and the vertical safe pillar is mined by filling method of upward approach. According to the mining conditions of the transitional section filling mining area, the upward horizontal stratified filling method and the upward approach filling method are determined. The subsequent filling method in the sublevel goaf is the alternative mining method in the filling mining area. Eight main factors in economic and technical aspects are selected as the evaluation indexes, and the three alternative methods are selected by using the degree of separation and grey relational analysis method. It is determined that the best mining method in the transitional section filling mining area is the sublevel goaf subsequent filling method. The stability of the safety pillar is analyzed and the dimension of the safe pillar is determined. The stability evaluation model of the horizontal safe pillar in the transition section is established by dimensional analysis, and the stability of the horizontal safe pillar in the transitional section of Chengchao Iron Mine is analyzed by numerical simulation. Applying the numerical simulation results to the evaluation model, the horizontal safe pillar thickness of Chengchao Iron Mine is determined to be 17.5 m, and the relationship between the top width of vertical safe pillar and its stability is analyzed by numerical simulation. It is determined that the top width of the vertical safe pillar of Chengchao Iron Mine is 25 m. The test results show that the safe ore pillar in the transition section is not unstable and the ore recovery in the transition section is sufficient.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.36;TD861.1

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