A study of UG2 pillar strength using a new pillar database

IF 0.9 4区材料科学 Q3 Materials Science

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2023-07-13 DOI:10.17159/2411-9717/2656/2023

T. Oates, D. Malan

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引用次数: 0

Abstract

A recent experimental pillar extraction project at a UG2 bord-and-pillar mine presented a unique opportunity to compile a new pillar database. Currently, the South African hard rock bord-and-pillar mines are designed using the Hedley and Grant formula with a modified K-value. This empirically derived formula was developed for uranium mines in the Elliot Lake district of Canada. The use of this formula for the design of pillars in South Africa is questionable. Very few pillar failures have nevertheless been observed and its current calibrations for the various reef types are possibly too conservative. A new UG2 pillar database of 66 pillars, of which seven are classified as failed, was compiled by the authors. This enabled a revised 'first-order' calibration of the K-value for the Hedley and Grant formula. The new estimated value for the UG2 is K = 75 MPa. This gives a pillar strength that is more conservative than the PlatMine formula. This work should nevertheless be considered as only a preliminary calibration as the database was small. Further work is also required to determine whether the exponents in the formula for the width and height parameters are appropriate for UG2 pillars.

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利用一个新的矿柱数据库研究UG2矿柱强度

最近在UG2边界和矿柱矿进行的矿柱提取实验项目为编制新的矿柱数据库提供了一个独特的机会。目前，南非硬岩边界和矿柱矿山采用Hedley和Grant公式设计，并修改了K值。这个经验推导公式是为加拿大埃利奥特湖区的铀矿开发的。在南非使用这一公式设计支柱是值得怀疑的。然而，很少观察到支柱失效，目前对各种珊瑚礁类型的校准可能过于保守。作者编制了一个由66个支柱组成的新的UG2支柱数据库，其中7个被归类为失败支柱。这使得能够对Hedley和Grant公式的K值进行修订的“一阶”校准。UG2的新估算值为K=75 MPa。这给出了比PlatMine公式更保守的支柱强度。然而，由于数据库规模较小，这项工作应被视为只是初步校准。还需要进一步的工作来确定宽度和高度参数公式中的指数是否适用于UG2支柱。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The South African Institute of Mining and Metallurgy 工程技术-矿业与矿物加工

CiteScore

1.50

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： The Journal serves as a medium for the publication of high quality scientific papers. This requires that the papers that are submitted for publication are properly and fairly refereed and edited. This process will maintain the high quality of the presentation of the paper and ensure that the technical content is in line with the accepted norms of scientific integrity.