Full
Outline
Based on the continuous mining project of the deep double middle sections in the second mining area of Jinchuan Nickel Mine, numerical analysis of ground pressure control in the panel of deep double middle sections was carried out. By comparing the distribution of maximum unbalanced force, stress, and displacement field in the lower panel under five different schemes of ground pressure control technology, it was found that Scheme Ⅴ (advanced unloading through the upper and lower panels and trapezoidal approach with two mining intervals) had the best ground pressure control effect, with the lowest extreme value of maximum unbalanced force (1.20×108 N). The maximum principal stress of the backfill at the top of the panel was negative and no tensile stress was observed. Compared with Scheme I (advance unloading through the vein in panel and rectangular approach with one mining interval), Scheme V has an average minimum principal stress increase of 0.11％ and a maximum compressive stress increase of 1.56％. During the mining process, the tilting deformation of the backfill on the roof of the panel is minimized. The optimization of the ground pressure control technology scheme for the deep double middle sections shows that the “positive trapezium + concave” technology scheme has smaller stress fluctuations and displacement deformations, and the ground pressure control effect is better. The application and stability analysis results of deep mining engineering show that after adopting the optimized scheme of ground pressure control technology, the ore output of the mining area can meet the production capacity requirement of 4 million tons per year. The increase in frequency of microseismic events is relatively slow, and microseismic events occur uniformly without sudden clustering. The overall frequency coefficient of roadway damage in the 1 000 m middle section shows a decreasing trend year by year, which verifies the rationality of the ground pressure control technology scheme for the panel in deep double middle sections.
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| 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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