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| LI Hangkong1,YUAN Bensheng2,3,YU Lei1,SHI Feng2,3,SUN Guanglei4(1.China Railway Resources Group Co. Ltd.,Beijing 100039, China; |
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Received:March 11, 2024
Revised:March 11, 2024
Accepted:July 01, 2024
Published Online:August 05, 2025
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| DOI： |
| KeyWord:Underground mining; Deep mining; Filling mining; Ground pressure monitoring; Stope stability |
| Author | Institution |
| LI Hangkong |
China Railway Resources Group Co. Ltd.,Beijing |
| Yuan Bensheng |
Beijing General Research Institute of Mining and Metallurgy,Beijing |
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| Abstract: |
| A lead-zinc mine adopts the open pit subsequent filling method for mining. The filling system has not yet reached the design capacity, and the filling system is relatively lagging behind. Currently, two mining sites, 3901 and 3902, are being filled, making it impossible to fill the existing mining room in the middle section of 885m. There is a huge amount of underground mining sites waiting to be filled. After the completion of the one-step mining of 825m, it is impossible to carry out the two-step mining work in the middle section of 885-825m, which has caused certain difficulties in the production connection of the mine. In response to this situation, this article first studies the mining transition plan. The specific implementation plan is to accelerate the design and construction of the 825m to 765m middle section development project during the transition period of 4901-4906 mining sites, and form a mining system for the first mining site of the 765m middle section. After the mining of the 4901-4906 mining area in the middle section of 825m is completed, the goaf is immediately reinforced and filled, creating conditions for the upward mining of the combined mining area in the horizontal range of 765-870m. After the combined mining area within the horizontal range of 765-870m is completed, the goaf is immediately subjected to centralized reinforcement filling, creating conditions for the two-step mining within the horizontal range of 870-930m to complete the transition. Under the condition of filling and maintaining the middle section of the 825m mining room, the corresponding lower 765m middle section mining can be carried out first. After the mining of the 825m middle section is completed, the goaf is immediately subjected to centralized reinforcement filling. The one-step mining room in the 765m middle section and the two-step mining pillar in the 825m middle section are combined for "bottom-up" mining. When the two-step mining pillar in the 825m middle section is completed and the goaf is subjected to centralized reinforcement filling, the same conditions are created for the two-step mining pillar in the 885m middle section. Next, the stability and stability time of the 930-945m safety mine pillar during the transition period were evaluated using the width ratio beam slab method and the proportional span method. Finally, combined with ground pressure monitoring data, stability prediction and analysis of the security pillar were carried out to provide theoretical and data support for the transition plan of the lead-zinc mine mining, and to achieve continuous mining capacity and ground pressure safety during the transition period of a lead-zinc mine. |
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