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以莫尔-库仑(Mohr-Coulomb)塑性破坏准则为判据,应用大型三维非线性有限单元法程序3D-σ,对拟定的4种具有不同分段高度、分段数、护顶层厚度及切割槽宽度条件的改进型分段空场采矿法进行数值模拟分析,对切割槽形成后和矿房回采结束后的应力、安全率及塑性区分布进行了对比分析,根据模拟分析结果,确定了最优开采方案。矿山实际应用表明,该采矿方法矿石回采率为65.90%,矿石贫化率9.82%,在控制贫化率的同时,保持了较高的回采率。
Based on the Mohr-Coulomb plastic failure criterion, the 3D-σ program of large-scale three-dimensional nonlinear finite element method was used to simulate the four proposed sections with different segment heights, number of segments, Slot width of the improved section of the method of sub-field mining numerical simulation analysis of the cutting groove and mining after the end of the stress, safety and plastic zone distribution were compared, based on the results of simulation to determine the most Excellent mining program. The practical application of the mines shows that the ore recovery rate of the mining method is 65.90% and the ore dilution rate is 9.82%. While controlling the depletion rate, the recovery rate is maintained at a high level.