基于非形状及尺度的露天采场性能评价

Based on the independent scale performance index system to assess open stope

采场性能是通过最大开采量和最小贫化率确定的.目前的评价方法得到的结果是基于尺度的,无法比较不同尺度采场性能,而且不能考虑超欠采体的形状特征.针对上述问题本文构建了一组与尺度无关的评价指标.研究已有的评价指标,对一些基本形状进行特征分析.提出用圆度(C)表示超欠采面的规则程度;用延度(E)表示超欠采面的分散性及覆盖性;用半球度(H)表示超欠采体的等效深度;用相对体积(Rv)总体评价采场性能.确定了这四个无量纲指标值的范围和各指标的划分语义及其数值范围.构建的评价指标体系做到了评价方法、评价指标和评价标准的统一,这样就实现了不同尺度采场性能的比较.通过对4个构造的采场进行评价,得到了四个指标的评价值和语义,最后确定了各自的潜在失效方式.结果表明该方法简单易行,结果符合实际情况.

The open stope is generally assessed by the ability to achieve maximum extraetion with minimal dilution. The present evahtation measures to get result are based on the scale, the measures can not compare different scale stope performance and fail to adequately capture certain geometrical aspects of over-break or under-break. Aiming at these problems, the paper constructs a set of index with scale independent. The study of the existing evaluation indexes is used to analyze the characteristics of some typical shape. It is proposed to utilize a Circularity （C） measure for describing the regularity of shape of over-break and under-break, Extensivity （E） measure for describing the dispersity and spreadability of shape of over-break and under-break, Hemisphericity （H） measure for describing the equivalent depth of volume of over-break and under-break, Relative volume （Rv） measure for assess the stope performance. The four dimensionless and independent indexes were determined and given its value ranges, its numerical division according to semantic. The evaluation index system have unified evaluation method, evaluation index and evaluation standard, and then the comparison of the different scales of the stope performance is realized. The evaluation of four hypothetic stope obtained the value of the four indexes and their semantic, and then determined their potential failure mode. The results show that the method is simple, and the results conform to the actual situation.