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Study on Mining Scheme and Stability of Isolated Pillar in a Metal Mine Transitioning from Open-Pit to Underground Mining
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Limin XIAO1, 2, Peng XIONG1, 2, Xiang DONG1, 2
Mining Research and Development | 2025, 45(8) : 22 - 29
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Mining Research and Development | 2025, 45(8): 22-29
Study on Mining Scheme and Stability of Isolated Pillar in a Metal Mine Transitioning from Open-Pit to Underground Mining
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Limin XIAO1, 2, Peng XIONG1, 2, Xiang DONG1, 2
Affiliations
  • 1.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan 410012, China
  • 2.State Key Laboratory of Metal Mine Safety Technology, Changsha, Hunan 410012, China
Published: 2025-08-25
Outline
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In order to realize the safe and efficient mining of isolated pillars in metal mines transitioning from open-pit to underground mining, Mathews stability diagram method was used to calculate stope parameters. Combined with FLAC3D software, the influence of different mining methods on stope stability was analyzed. Upward drift filling mining method + construction of artificial false roof mining scheme was verified by field test. The results show that the hydraulic radius of the hanging wall of the designed stope is 1.64 m, and the maximum span of the roof without support is 3.5 m, both of which are within the safe range of theoretical calculation. The structural parameters of the stope meet the safety requirements. Under the mining method of skip mining, the maximum compressive stress and maximum tensile stress of the stope are less than the compressive strength and tensile strength of the rock mass, and the formed plastic zone does not penetrate the stope, indicating that the stope is in a stable state. In the field test, the production capacity of a single ore block reaches 100 t/d, the loss rate is 4%, and the dilution rate is 5% after the application of the mining scheme of the upward drift filling mining method + 1.5 m thick reinforced concrete artificial false roof and the mining method of skip mining. The number of ore blocks is stable and the economic benefit is good.

Transition from open-pit to underground mining  /  Isolated pillar mining  /  Stope stability  /  Upward drift filling mining method  /  Numerical simulation
肖利民, 熊鹏, 董翔. 某露天转地下开采金属矿山隔离矿柱回采方案及稳定性研究. 矿业研究与开发, 2025 , 45 (8) : 22 -29 .
Limin XIAO, Peng XIONG, Xiang DONG. Study on Mining Scheme and Stability of Isolated Pillar in a Metal Mine Transitioning from Open-Pit to Underground Mining[J]. Mining Research and Development, 2025 , 45 (8) : 22 -29 .
Year 2025 volume 45 Issue 8
82
42
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  • Receive Date:2024-11-22
  • Online Date:2026-10-28
  • Published:2025-08-25
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  • Received:2024-11-22
Affiliations
    1.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan 410012, China
    2.State Key Laboratory of Metal Mine Safety Technology, Changsha, Hunan 410012, China
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表12种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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