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| Key technologies and applications for underground mining of fractured and gently inclined ore deposits |
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Received:November 14, 2024
Revised:January 18, 2025
Accepted:February 06, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.01.003 |
| KeyWord:fractured deposit;mining method optimization;stope stability analysis;medium-length hole blasting optimization;roadway support |
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| 1.Sinosteel Anhui Liutangfang Mining Co. Ltd., Lu'an 237471, Anhui, China;2.School of Resources Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;3.College of Mining Engineering, University of Science and Technology Liaoning, Anshan 114000, Liaoning, China |
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| Abstract: |
| The mining of fractured and gently inclined ore deposits has long been a challenging technical problem in mining engineering. To address the issues of high safety risks and low efficiency in extracting such ore bodies at Liutangfang Iron Mine under existing mining methods, this study conducted systematic research on the optimization of mining methods and stope structure parameters, medium-length hole caving technology in multi-jointed rock masses, and control techniques for surrounding rock spalling in roadways. Based on a combined subjective and objective weighting method, the subsequent filling mining method with sublevel open stoping was selected as optimal. Through stability analysis of the stope using FLAC3D numerical simulation, and considering both safety and economic factors, the optimal stope structure parameters were determined as follows: length 40 m, width 15 m, and rib pillar thickness 7 m. A blastability classification database based on the development degree of different joint fissures was established, and an automatic design program for medium-length holes was developed, achieving refined management of medium-length hole caving blasting. Using a combination of engineering analogy and numerical simulation, the distribution characteristics of in-situ stress in the mine were analyzed. It was revealed that the spalling failure of the surrounding rock in the footwall external roadway results from stress redistribution caused by ore body extraction. The minimum safe distance between the roadway and the footwall ore-rock interface was determined to be 15–30 m, and corresponding optimization parameters and dynamic control measures for roadway support were proposed. The research results provide theoretical basis and technical support for the safe, efficient, and economical mining of Liutangfang Iron Mine, enabling annual savings in mining costs of approximately 37.47 million yuan. This study offers valuable reference for similar mining conditions. |
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