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埃塞俄比亚南部古吉地区乌拉-乌洛砂金矿提高黄金回收率的露天矿设计。

Open pit design for improved gold recovery at Ula-Ulo placer deposit in Guji, southern Ethiopia.

作者信息

Belay Habtamu, Chala Endalu Tadele, Jilo Nagessa Zerihun, Gebrehiwot Gidey, Ahmad Mirza Iftikhar

机构信息

Department of Mining Engineering, College of Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.

Oromia Mining Share Company, Addis Ababa, Ethiopia.

出版信息

Sci Rep. 2025 Aug 2;15(1):28269. doi: 10.1038/s41598-025-13512-3.

DOI:10.1038/s41598-025-13512-3
PMID:40753293
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12317991/
Abstract

This study examines slope stability at the Ula Ulo Placer gold mine in the Adola Belt, Guji, southern Ethiopia, where open-pit mining enables flexible mineral extraction but presents significant stability concerns. Frequent slope failures have disrupted operations and delayed production. This research aims to evaluate and improve the stability of the open-pit excavation through an integrated approach combining field investigations, laboratory testing, and numerical modeling. Fieldwork included detailed slope geometry and orientation measurements, in situ testing, and soil and rock sampling for laboratory analysis. Stability assessment was performed using both the Limit Equilibrium Method (LEM) and the Finite Element Method (FEM) via Slide 2D (v6.0) and Phase2 (v8.0) software. The variables analyzed included bench angle, width, overall slope angle, and geotechnical properties under drained and undrained conditions. The analysis indicated that a 40° slope was unstable and unsuitable, while a 30° slope provided high stability but involved excessive excavation. A 35° slope was found to be the most practical solution, offering an effective balance between structural safety and excavation requirements.

摘要

本研究考察了埃塞俄比亚南部古吉州阿多拉带乌拉乌洛砂金矿的边坡稳定性，该矿的露天开采便于灵活开采矿石，但存在重大的稳定性问题。频繁的边坡失稳扰乱了作业并延误了生产。本研究旨在通过结合现场调查、实验室测试和数值模拟的综合方法，评估并提高露天矿开挖的稳定性。现场工作包括详细的边坡几何形状和方向测量、原位测试以及采集土壤和岩石样本用于实验室分析。通过Slide 2D（v6.0）和Phase2（v8.0）软件，采用极限平衡法（LEM）和有限元法（FEM）进行稳定性评估。分析的变量包括台阶角度、宽度、整体边坡角度以及排水和不排水条件下的岩土特性。分析表明，40°的边坡不稳定且不合适，而30°的边坡稳定性高，但开挖量过大。结果发现35°的边坡是最实际的解决方案，在结构安全和开挖要求之间实现了有效平衡。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/137182650ebf/41598_2025_13512_Fig11_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/78abf3028141/41598_2025_13512_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/9912031fbdff/41598_2025_13512_Fig5_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/137182650ebf/41598_2025_13512_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/7a389b35fdc1/41598_2025_13512_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/fdf3f6d98ba4/41598_2025_13512_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/26e1b19e2a79/41598_2025_13512_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/78abf3028141/41598_2025_13512_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/9912031fbdff/41598_2025_13512_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/9bbbfc534d0c/41598_2025_13512_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/e888b9b65fab/41598_2025_13512_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/5875c0c787fb/41598_2025_13512_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/a3f32ac2afb6/41598_2025_13512_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/2024c9bf4af3/41598_2025_13512_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/26f3/12317991/137182650ebf/41598_2025_13512_Fig11_HTML.jpg

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本文引用的文献

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2
Rock slope stability analysis of a limestone quarry in a case study of a National Cement Factory in Eastern Ethiopia.埃塞俄比亚东部某国家水泥厂案例研究中的石灰石采石场岩质边坡稳定性分析
Sci Rep. 2024 Aug 9;14(1):18541. doi: 10.1038/s41598-024-69196-8.
3
Analysis of stability law and optimization of slope angle during excavation of deep concave mine slope.
深凹露天矿边坡开挖过程中稳定性规律分析及边坡角优化。
PLoS One. 2022 Jul 21;17(7):e0271700. doi: 10.1371/journal.pone.0271700. eCollection 2022.