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Improving performance of open-pit mine production scheduling problem under grade uncertainty by hybrid algorithms

混合算法改善品位不确定露天矿生产调度问题的性能

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Abstract

One of the surface mining methods is open-pit mining, by which a pit is dug to extract ore or waste downwards from the earth’s surface. In the mining industry, one of the most significant difficulties is long-term production scheduling (LTPS) of the open-pit mines. Deterministic and uncertainty-based approaches are identified as the main strategies, which have been widely used to cope with this problem. Within the last few years, many researchers have highly considered a new computational type, which is less costly, i.e., meta-heuristic methods, so as to solve the mine design and production scheduling problem. Although the optimality of the final solution cannot be guaranteed, they are able to produce sufficiently good solutions with relatively less computational costs. In the present paper, two hybrid models between augmented Lagrangian relaxation (ALR) and a particle swarm optimization (PSO) and ALR and bat algorithm (BA) are suggested so that the LTPS problem is solved under the condition of grade uncertainty. It is suggested to carry out the ALR method on the LTPS problem to improve its performance and accelerate the convergence. Moreover, the Lagrangian coefficients are updated by using PSO and BA. The presented models have been compared with the outcomes of the ALR-genetic algorithm, the ALR-traditional sub-gradient method, and the conventional method without using the Lagrangian approach. The results indicated that the ALR is considered a more efficient approach which can solve a large-scale problem and make a valid solution. Hence, it is more effectual than the conventional method. Furthermore, the time and cost of computation are diminished by the proposed hybrid strategies. The CPU time using the ALR-BA method is about 7.4% higher than the ALR-PSO approach.

摘要

露天采矿工艺是地表采矿的一种方法, 通过开挖坑洞从地表向下开采矿石或废物。工业生产过 程中, 露天矿的长期生产调度(LTPS)问题是最大的生产难题之一, 而基于确定性方法和不确定性的方 法被认为是解决此类问题的主要策略。在过去几年中, 许多研究人员充分探究了一种成本较低的新型 计算法, 即元启发式方法, 用以解决矿山设计和生产调度问题。该方法尽管无法保证最终方案的最优 性, 但能够以相对较低的计算成本推算出足够优秀的解决方案。本文提出了增**拉格朗日松弛(ALR) 与粒子群优化(PSO), 以及ALR 和蝙蝠算法(BA)的两种混合算法模型, 以解决不确定品位条件下的露 天矿生产调度问题。该混合模型采用ALR 方法解决露天矿生产调度问题, 以提高其计算性能并加快 收敛速度, 并通过PSO 或BA 更新拉格朗日系数。所提出的计算模型与ALR 遗传算法、ALR 传统次 梯度法和常规方法(未使用拉格朗日方法)的计算结果进行了比较, 结果表明:相比于常规方法, ALR 法可以更加有效地解决大规模问题, 并提出合理的解决方案。此外, 混合算法可以降低计算时间和成 本, ALR-BA 方法的CPU 运算时间比ALR-PSO 方法大约高7.4%。

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Correspondence to Ehsan Moosavi.

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The main research targets were expanded by Ehsan MOOSAVI and Kamyar TOLOUEI. Kamyar TOLOUEI and Ehsan MOOSAVI conducted the literature review and wrote the first draft of the manuscript. Ehsan MOOSAVi and Kamyar TOLOUEI established the models and calculated the results. Amir Hossein BANGIAN TABRIZI, Peyman AFZAL and Abbas AGHAJANI BAZZAZI analyzed the calculated results and edited the draft of manuscript. All authors replied to reviewers & apos; comments and revised the final version.

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Kamyar TOLOUEI, Ehsan MOOSAVI, Amir Hossein BANGIAN TABRIZI, Peyman AFZAL, Abbas AGHAJANI BAZZAZI declare that they have no conflict of interest.

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Tolouei, K., Moosavi, E., Bangian Tabrizi, A.H. et al. Improving performance of open-pit mine production scheduling problem under grade uncertainty by hybrid algorithms. J. Cent. South Univ. 27, 2479–2493 (2020). https://doi.org/10.1007/s11771-020-4474-z

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