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| Simulation study on stope structural parameters and stability under trackless mining |
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Received:August 16, 2022
Revised:August 25, 2022
Accepted:September 09, 2022
Published Online:June 25, 2023
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| DOI： |
| KeyWord:Trackless mining; 3D-σ; Stope parameter optimization; Immediate acknowledgment roof. |
| Author | Institution |
| SUN Zhenguo |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| HOU Kepeng |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| SUN Huafen |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| Shi Lei |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| MA Shengjie |
School of Land and Resources Engineering,Kunming University of Since and Technology |
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| Abstract: |
| The ore body occurrence conditions of a mine in Yunnan are complex, the ore rock is broken and soft, and the trackless equipment mining is used in the later transformation, which leads to the increase of the section of the stope roadway, and the original mining technology and stope parameters are no longer applicable. In order to ensure the safety of the mining process and find out the reasonable stope structure parameters suitable for mine production, the 3D-σ finite element simulation software was used to establish the three-dimensional model of the stope, and the point pillar and continuous pillar stope structure forms of different span direct roof were designed. The stress, safety rate and plastic zone of ore rock under different stope structure forms were simulated and analyzed. The results show that when the stope form of retaining point pillar is adopted, the size of point pillar in the stope should not be less than 2 m, and the span of the mine room should be controlled at 4 m. When the stope form of retaining continuous pillars is adopted, the structural parameters of the stope are recommended to retain 4m wide continuous pillars, the span of the room is 5m, and the C20 concrete is used for the entry filling mining. Combined with the simulation analysis of stope and the actual production situation of mine, it is suggested to adopt the mining scheme of retaining continuous pillar. The subsequent field test proves that the scheme can not only ensure the stability of the stope structure, achieve the purpose of safe mining, but also effectively reduce the loss and dilution of ore and improve the economic benefits of the mine. |
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