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Joint simulation of coal quality attributes using a new simulated annealing-based method of diagonalisation 基于模拟退火对角化的煤质属性联合模拟
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-30 DOI: 10.1080/17480930.2023.2165312
B. Sohrabian, Saeed Soltani-Mohammadi, A. Tercan
ABSTRACT A new approach is proposed for simultaneous diagonalisation of variance-covariance matrices to generate spatially orthogonal factors using based on simulated annealing method. Simultaneous diagonalisation was applied to three quality attributes of a coal seam. The proposed method was successful in diagonalisation due to creating factors with cross-variograms that lie in tighter intervals compared with minimum/maximum autocorrelation factors (MAF). Simulation through the proposed approach showed variable dependent results in terms of reproducing mean values, variances, correlation coefficients, and auto-variograms of variables. However, the new approach showed advantage over MAF in reproducing the cross-variograms of variables, especially in the downhole direction.
摘要提出了一种基于模拟退火方法的方差-协方差矩阵同时对角化生成空间正交因子的新方法。将同时对角化应用于煤层的三个质量属性。所提出的方法在对角化方面是成功的,因为与最小/最大自相关因子(MAF)相比,所创建的因子具有更紧密的区间内的交叉变差函数。通过所提出的方法进行的模拟显示了在重现变量的均值、方差、相关系数和自方差图方面的变量相关结果。然而,在再现变量的交叉方差图方面,特别是在井下方向上,新方法显示出优于MAF的优势。
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引用次数: 0
A discrete element modelling of gravity flow in sublevel caving considering the shape and size distribution of particles 考虑颗粒形状和大小分布的分段崩落重力流离散元模型
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.1080/17480930.2023.2168870
Mahdeyeh Firouzabadi, K. Esmaeili, Gholamreza Saeedi Rashkolia, Mohsen Asadi
ABSTRACT One of the most significant challenges for cave mining methods is dilution, a process which is generally controlled by the gravity flow of caved materials. In this study, the discrete element method (DEM) was used to investigate the effects of changing the porosity of blasted ring material and caved waste rocks and of changing the ring inclination on material flow in a sublevel cave (SLC) mine. Yade software was used to simulate two-dimensional gravity flow in a longitudinal section of the sublevel while taking into consideration the shape and size distribution of the flowing rock particles. Four simulations were generated with different porosities, and the material flow in the models was compared to each other. The results demonstrate that when ring porosity is increased, dilution decreases, and the height of the extraction zone grows longitudinally. Also, a lower porosity of the blasted ore material in the ring can cause early dilution entry and expansion of the extraction zone towards the caved waste.. Finally, the effect of ring inclination on the material flow and dilution was investigated. The results of these simulations show an increased dilution as the ring inclination increases and a change in the shape of the extraction zone.
溶洞采矿方法面临的最大挑战之一是贫化,这一过程通常由溶洞材料的重力流控制。采用离散元法(DEM)研究了改变爆破环体材料和崩落废石孔隙度以及改变环体倾角对分段溶洞矿山物质流动的影响。采用Yade软件,在考虑流动岩石颗粒的形状和尺寸分布的情况下,模拟亚水平段纵断面的二维重力流。在不同孔隙度条件下进行了四种模拟,并对模型中的物质流动进行了比较。结果表明:随着环孔隙度的增大,稀释度减小,萃取区高度纵向增大;此外,较低的孔隙率爆破的矿石材料在环可以导致早期稀释进入和扩大的提取区向陷落的废物。最后,研究了环倾角对物料流动和稀释的影响。这些模拟结果表明,随着环倾角的增加和萃取区形状的变化,稀释度增加。
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引用次数: 1
Physical properties of mine drainage sediment according to depth in settling ponds 根据沉淀池深度确定的矿井排水沉积物的物理特性
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-10 DOI: 10.1080/17480930.2023.2166248
Dong-kil Lee, Joonhak Lee, Y. Cheong, Jongmyung Park
ABSTRACT In order to effectively manage the sludge in the settling ponds, it is necessary to understand the physical properties of the sludge according to the depth in the pond. A new sludge sampling device and method was proposed in this study. Sludge was sampled at three depths in four facilities in South Korea, and the water content, particle size, density, composition, and viscosity of the sediment according to the depth were measured and evaluated. These results can be used to predict the shape of sediment and the lifetime of the settling pond, and to plan and effectively implement sediment removal.
摘要为了有效地管理沉淀池中的污泥,有必要根据沉淀池的深度来了解污泥的物理特性。本研究提出了一种新的污泥取样装置和方法。在韩国四个设施的三个深度对污泥进行了采样,并根据深度测量和评估了沉积物的含水量、粒度、密度、成分和粘度。这些结果可用于预测沉积物的形状和沉淀池的使用寿命,以及规划和有效实施沉积物去除。
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引用次数: 0
Experimental study of mudrush mechanisms under different moisture contents in block caving 不同含水率下块体冒落泥机理的试验研究
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-09 DOI: 10.1080/17480930.2023.2166761
R. Castro, F. Betancourt, R. Gómez, O. Salas, J. Zarabia
ABSTRACT Mud-rush mechanisms during ore extraction have not been fully studied. In this study, a new experimental setup was created to analyse mud-rush events under controlled conditions. A block caving drawbell was scaled and filled with wet granular material to be extracted. The material drawn was then classified based on its consistency index. The results showed that the yield stress and the material consistency are good predictors of mud events in the experimental results. Finally, mud-rush events occurred mainly when material consistency was classified as plastic, soft, or fluid – with soft and fluid being the most significant.
矿石开采过程中的泥浆冲击机制尚未得到充分研究。在这项研究中,建立了一个新的实验装置来分析受控条件下的泥涌事件。对一个块体崩落式抽矿钟进行了缩放,并用待提取的湿颗粒材料填充。然后根据其稠度指数对绘制的材料进行分类。结果表明,屈服应力和材料稠度是实验结果中泥浆事件的良好预测因素。最后,冲泥事件主要发生在材料稠度分为塑性、软性或流体时,其中软性和流体最为显著。
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引用次数: 2
Near-face stockpile open pit mining: a method to enhance NPV and quality of the plant throughput 近面堆料露天开采:一种提高净现值和工厂生产质量的方法
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-12-28 DOI: 10.1080/17480930.2022.2160891
Hongshuo Gong, M. Tabesh, A. Moradi Afrapoli, H. Askari-Nasab
ABSTRACT Stockpiles are of great importance in open pit mine production scheduling and are widely used for different reasons while being placed in different locations. Near face stockpile (NFS) is a new mining concept which combines the IPCC (in-pit crushing and conveying) method with an in-pit near-face (and near crusher) stockpile. The stockpile decouples the whole mining flow into two weakly related subsystems, which are the mining subsystem and processing subsystem. There are many theoretical advantages in comparison to the traditional open-pit mining method, such as higher tolerance on uncertainties without compromising production, higher equipment utilisation, less operating cost, better blending results, etc. The introduction of NFS, however, requires reconsideration of production planning in open pit mines. In this paper, we developed a mixed integer linear programming model to solve long-term production scheduling problem in open pit mines. To quantitatively measure the performance of the NFS mining method, we implemented the model in a real mining case study and compared the results with the traditional open pit mining method with an out-of-pit crusher. The results reveal that implementing the NFS method can improve the net present value by 9.3% and decrease the plant MWT head grade deviation by 20%.
摘要料堆在露天矿生产调度中具有重要意义,由于不同的原因,料堆在不同的位置被广泛使用。近工作面堆(NFS)是一种新的采矿概念,它将IPCC(矿井内破碎和输送)方法与矿井内近工作面(和近破碎机)堆相结合。料堆将整个采矿流程解耦为两个弱相关的子系统,即采矿子系统和加工子系统。与传统的露天采矿方法相比,有许多理论优势,如在不影响生产的情况下对不确定性的容忍度更高、设备利用率更高、运营成本更低、混合效果更好等。然而,NFS的引入需要重新考虑露天矿的生产计划。本文建立了一个混合整数线性规划模型来求解露天矿的长期生产调度问题。为了定量测量NFS采矿方法的性能,我们在一个实际的采矿案例研究中实现了该模型,并将结果与传统的露天采矿方法进行了比较。结果表明,采用NFS方法可以使净现值提高9.3%,使工厂MWT原矿品位偏差降低20%。
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引用次数: 1
Innovative AI-based multi-objective mixture design optimisation of CPB considering properties of tailings and cement 考虑尾砂和水泥特性的创新型人工智能CPB多目标优化设计
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-12-28 DOI: 10.1080/17480930.2022.2156724
Ehsan Sadrossadat, H. Basarir, A. Karrech, M. Elchalakani
ABSTRACT Cemented paste backfill (CPB) is a profitable tailings management strategy for underground mines. CPB is designed to meet specific objectives and constraints such as strength and workability at reasonable costs. Traditional design of CPB is costly due to large number of variables such as properties of tailings/cement. This paper proposes an innovative AI-based approach for multi-objective mixture design optimisation of CPB considering properties of tailings and cement. This approach contributes to meliorating mine economy according to the United Nations Sustainable Development Goals by reducing the amount of cement considering pozzolanic potential of tailings, thereby reducing carbon footprint and operational costs.
摘要/ ABSTRACT摘要:胶结膏体充填(CPB)是一种效益显著的地下矿山尾矿管理策略。CPB旨在以合理的成本满足特定的目标和限制,例如强度和可加工性。由于尾矿/水泥特性等变量较多,传统的CPB设计成本较高。本文提出了一种基于人工智能的多目标CPB混合料优化设计方法。根据联合国可持续发展目标,这种方法通过减少水泥用量,考虑到尾矿的火山灰潜力,从而减少碳足迹和运营成本,有助于改善矿山经济。
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引用次数: 1
An insight into failure of iron ore mine tailings dams 铁矿尾矿坝溃坝机理研究
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-12-28 DOI: 10.1080/17480930.2022.2159295
Francis Otieno, S. Shukla
ABSTRACT Mine tailings dams are surface impoundment structures consisting of raised embankments that are built to contain mine tailings and mill effluents. In the past, many failures of these iron ore mine tailings storage facilities/dams have been reported worldwide in different forms. In this paper, an attempt has been made to review the failure modes, mechanisms and possible solutions to enhance the stability and safety of iron ore tailings dams. A comprehensive investigation has been carried out on 16 failure cases of such dams that were reported from 1917 to the current period. Additionally, mineralogy of iron ore tailings has been provided. The analysis of the past failures shows that most failures took place as a result of slope instability, overtopping, liquefaction-related instability, foundation movement and some form of structural failure. It has been found that 31.25% of iron ore mine tailings dams collapsed due to slope instability, 18.75% due to overtopping, 6.25% due to liquefaction-related instabilities, 6.25% due to foundation failure, 6.25% due to erosion, and 6.25% due to structural failure. In 25% of the failure cases, the causes have been unknown. An attempt is also made here to present prevention and remediation measures for avoiding failures and the associated negative environmental impacts in future.
尾矿坝是一种地表蓄水结构,由凸起的堤坝组成,用于容纳尾矿和选矿厂废水。过去,世界各地都以不同的形式报道了这些铁矿尾矿储存设施/大坝的许多故障。本文试图综述尾矿坝的破坏模式、机理和可能的解决方案,以提高尾矿坝的稳定性和安全性。对1917年至现阶段报告的16起此类大坝的破坏案例进行了全面调查。此外,还提供了铁矿尾矿的矿物学。对以往失效的分析表明,大多数失效是由边坡失稳、漫顶、液化相关失稳、地基移动和某种形式的结构失效引起的。研究发现,31.25%的铁矿尾矿坝因边坡失稳而坍塌,18.75%的尾矿坝因漫顶而坍塌,6.25%的尾矿库因液化相关失稳而倒塌,6.25%因地基破坏而倒塌,62.5%因侵蚀而倒塌,以及6.25%因结构破坏而倒塌。在25%的失败案例中,原因是未知的。本文还试图提出预防和补救措施,以避免未来的故障和相关的负面环境影响。
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引用次数: 3
Differentiation of artificial rocks in mechanical cutting using acoustics emission (AE) towards selective mining 利用声发射(AE)对机械切割中人造岩石的选择性开采进行区分
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-12-17 DOI: 10.1080/17480930.2022.2152170
S. Yasar, A. Abdallah, T. Shepel, J. Bretschneider, C. Drebenstedt
ABSTRACT In this paper, acoustic emission (AE) method was used to differentiate three concretes having different strengths in laboratory. Cutting tests under different conditions in full-scale cutting testing rig coupled with AE measurements were realised. AE measurements were evaluated by means of magnitude. Afterwards, moving maximum algorithm was utilised to process AE signals, and processed plots were employed to create surface contour plots. It was clearly seen that AE measurements can be used to differentiate materials being cut in terms of strength differences, such that higher strength concrete yielded higher magnitudes of AE signals where lower strength concrete showed lower magnitudes.
摘要:本文采用声发射(AE)方法在实验室中对三种不同强度混凝土进行了区分。在全尺寸切削试验台上进行了不同条件下的切削试验,并进行了声发射测量。声发射测量通过震级进行评估。然后,利用移动极大值算法对声发射信号进行处理,并利用处理后的图生成地表等高线图。可以清楚地看到,声发射测量可以根据强度差异来区分被切割的材料,例如高强度混凝土产生的声发射信号强度较高,而低强度混凝土显示的声发射信号强度较低。
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引用次数: 1
Utilisation of geometallurgical predictions of processing plant reagents and consumables for production scheduling under uncertainty 在不确定条件下,利用工厂试剂和耗材的地质冶金预测进行生产调度
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-12-05 DOI: 10.1080/17480930.2022.2139350
C. Both, R. Dimitrakopoulos
ABSTRACT Consumption rates of reagents and consumables are typically accounted for in mine production scheduling by simple cost adjustment factors per rock type or mining block, ignoring geological uncertainty, blending, and geometallurgical information. To overcome these limitations, this article first creates empirical geometallurgical prediction models of reagents and consumables by tracking blended rock properties that are matched with observed consumption rates at the operating processing plant. The prediction models are then integrated in a simultaneous stochastic optimisation model for short-term production scheduling. Improvements over a conventional short-term production schedule are demonstrated in a case study at the Tropicana Gold mining complex.
摘要:在矿山生产计划中,试剂和消耗品的消耗率通常通过每种岩石类型或采矿区块的简单成本调整因素来计算,忽略了地质不确定性、混合和地质冶金信息。为了克服这些限制,本文首先通过跟踪与运营加工厂观察到的消耗率相匹配的混合岩石特性,创建了试剂和耗材的经验几何预测模型。然后将预测模型集成到用于短期生产调度的同时随机优化模型中。Tropicana金矿综合体的一个案例研究证明了传统短期生产计划的改进。
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引用次数: 2
Effect of soil quality and planting material on the root architecture and the root anchorage of young hybrid poplar plantations on waste rock slopes 土壤质量和种植材料对废石坡地杂交杨树苗根系构型和根系锚固的影响
IF 2.4 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2022-11-15 DOI: 10.1080/17480930.2022.2144020
K. Babi, M. Guittonny, B. Bussière, G. Larocque
ABSTRACT On mine waste rock slopes, trees with inadequate root development could be prone to uprooting. The anchorage of trees is mainly determined by the architecture of the root systems that drive their mechanical interactions with the soil. The objective of this study was to evaluate the effects of soil quality and of different planting materials on the architecture and resistance to shear stress of root systems of hybrid poplars four years after they were initially planted. The study was conducted in an open-pit-gold mine. A hybrid poplar plantation was established in 2013 on 33% soil-covered waste rock slopes, using a randomised complete block design, that is, 3 replicated blocks × 3 planting materials × 2 soil qualities. The stability of the hybrid poplars (resistance to uprooting) was evaluated using lateral traction tests. Complete excavations were performed to characterise their coarse root (>4 mm) architecture. Results showed no significant differences between treatments in terms of the maximum resistance force to uprooting, which varied between 7142 and 8989 N. After four growing seasons, no significant effects due to soil quality or planting material were observed in the number of lateral roots, mean root diameter, root biomass, aboveground biomass, and shoot/root ratio.
摘要在矿山废石边坡上,根系发育不充分的树木很容易被连根拔起。树木的锚固主要由驱动其与土壤机械相互作用的根系结构决定。本研究的目的是评估土壤质量和不同种植材料对杂交杨树初始种植四年后根系结构和抗剪应力的影响。这项研究是在一个露天金矿进行的。2013年,采用随机完全块体设计,即3个重复块体,在33%的土壤覆盖的废石斜坡上建立了一个杂交杨树种植园 × 3种种植材料 × 2土壤质量。采用侧向牵引试验对杂交杨树的稳定性(抗连根拔)进行了评价。进行了完整的挖掘,以表征其粗根(>4 mm)架构。结果表明,不同处理对连根拔起的最大阻力在7142~89899N之间没有显著差异。经过四个生长季节,侧根数量、平均根径、根生物量、地上生物量和地上茎根比没有受到土壤质量或种植材料的显著影响。
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引用次数: 2
期刊
International Journal of Mining Reclamation and Environment
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