Full
Outline
The shape of the ore draw-out body is the basis for determining the stope structural parameters of the non-pillar sublevel caving method, and the ore moisture content and the fine particle content are the two important factors affecting the shape of the ore drawing body. Taking the ore under the overlying rock of an iron ore caving stope as the research object, the similar physical experiment and numerical simulation of ore drawing were carried out under the conditions of ore moisture content of 0−8% and fine particle content of 5%−25%. The values of λ1and λ2 of the vertical and horizontal axis ratios were used as indicators to evaluate the shape of the ore drawing body, and the shape characteristics of the ore drawing body under the synergistic effect of moisture content and fine particle content were explored. The results show that the values of λ1 and λ2 of drawing body of physical ore drawing test are consistent with those of the numerical simulation. With the decrease of moisture content or fine particle content, the values of λ1 and λ2 of the drawing body decrease, and the shape of the drawing body is closer to the shape of pour water drop. On the contrary, the closer the shape of the drawing body is to the ellipsoid shape. When the moisture content of the ore is 0 and the fine particle content is 5%, the shape of the drawing body is the best, and the ore drawing effect is the best. When the moisture content of the ore is 8% and the fine particle content is 15%−25%, the ore drawing is blocked and the ore drawing effect is the worst. When the moisture content is 2% and the fine particle content changes in the range of 5%−25%, or the fine particle content is 10% and the moisture content changes in the range of 0−8%, the change of the values of λ1 and λ2 of the drawing body is the smallest, and the shape of the drawing body is the least affected by the synergistic effect of moisture content and fine particles. The research results provide a reference for the optimization of stope structure parameters of the non-pillar sublevel caving method.
51
26
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
