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介绍了大红山铜矿二期工程的分段空场嗣后尾砂充填采矿工艺。针对该矿在上下两层矿体开采过程中的下层开采矿体时,两层矿体盘区间的夹层失稳垮塌的危险大大增加的问题,使用三维有限单元法进行了数值分析与结果表明,下层矿体开采时,在盘区中部留设点柱,可使上下两盘区隔层中的拉应力数值显著降低,隔层稳定性显著提高。实际生产中,采取留设点柱的措施后,采场顶板垮塌问题得到有效控制,贫化率和损失率均显著降低。取得了以较低的代价,获得较高经济效益的成果。对矿体厚度和面积均较大的盘区,矿柱强度随其高度-厚度比的升高而下降,因此,采取了在盘区内部留设面积相对较大、供矿末期才爆破的临时矿柱,保障了主要供矿期间隔层的稳定性。
The second stage of the Dahongshan Copper Mine was introduced into the process of tailing sand filling. Aiming at the problem that when the lower orebody is mined in the upper and lower two layers of orebody mining process, the risk of collapse and instability of mezzanine in the two ore body plates is greatly increased, the numerical analysis is conducted by using the three-dimensional finite element method and the results show that, When the lower ore body is mined, a point column is set in the central part of the panel so as to remarkably reduce the tensile stress in the upper and lower compartments and significantly improve the stability of the interlayer. In the actual production, adopting the measures of leaving a point column, the roof collapse in the stope was effectively controlled, and both the dilution rate and the loss ratio were significantly reduced. Achieved at a lower price, access to higher economic benefits of the results. For the thicker plate and the larger area of the ore body, the strength of the ore column decreases with the increase of the height-thickness ratio. Therefore, a temporary area reserved in the interior of the panel for relatively large area for blasting at the end of the ore is adopted Pillar, to protect the stability of the interlayer during the main supply.