The open stope is generally assessed by the ability to achieve maximum extraction with minimal dilution. The present evaluation 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.
Key words
open stope /
independent scale /
shape-size /
stope performance /
index system
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References
[1] Villaescusa E. Geotechnical design for dilution control in underground mining[M]// Singhal R. Mine Planning and Equipment Selection. Balkema, Rotterdam, 1998: 141-149.
[2] Villaescusa E. Quantifying open stope performance[C]// Proceedings of the MassMin 2004, Santiago, Chile, 2004: 96-104.
[3] Davis J C. Statistics and data analysis in geology[M]. 3rd ed. New York: Wiley, 2002.
[4] Mathews K E, Hoek E, Wyllie D C, et al. Prediction of stable excavation spans for mining at depths below 1000m in hard rock mines[R]. CANMET Report DSS OSQ80-00081, Ottawa, April 1981: 39.
[5] Clark L M, Pakalnis R C. An empirical design approach for estimating unplanned dilution from open stope hangingwalls and footwalls[C]// Proceedings of the 99th Annual General Meeting Canada Institute of Mining, Vancouver; 1997: 25.
[6] Potvin Y. Empirical open stope design in Canada[D]. University of British Columbia, Vancouver, 1989.
[7] 余明辉, 胡春燕, 梁艳洁, 等. 水力半径取值及衍生误差分析[J]. 武汉大学学报:工学版, 2010, 43(2): 143-147.Yu Minghui, Hu Chunyan, Liang Yanjie, et al. Analysis of value-taking and derived errors of hydraulic radio[J]. Engineering Journal of Wuhan University, 2010, 43(2): 143-147.
[8] 曹洪杨, 张力, 付念新, 等. 国内外铜渣的贫化[J]. 材料与冶金学报, 2009, 8(1): 33-39.Cao Hongyang, Zhang Li, Fu Nianxin, et al. Review of copper slag impoverishment[J]. Journal of Materials and Metallurgy, 2009, 8(1): 33-39.
[9] Windsor C R, Thompson A G. A course on structural mapping and structural analysis[M]. Rock Tech Pty Ltd, 1997.
[10] 邓东平, 李亮. 水平条分法下边坡稳定性分析与计算方法研究[J]. 岩土力学, 2012, 33(10): 3179-3188.Deng Dongping, Li Liang. Analysis of slope stability and research of calculation method under horizontal slice method[J]. Rock and Soil Mechanics, 2012, 33(10): 3179-3188.
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