Full
Outline
Multi-outlet ore drawing method is commonly adopted in underground mine production, and there is often an obvious arching phenomenon during the ore drawing process. To investigate the influence of multi-outlet ore drawing on the arching of granular ores, based on the theory of lateral pressure of granular materials, a lateral pressure testing system for granular material flow was used to conduct physical similarity simulation experiments under single-outlet, double-outlet, and triple-outlet ore drawing conditions. The distribution laws of lateral pressure of granular ores under different ore drawing methods and filling heights were obtained, so as to further analyze the ore arching phenomenon. The research results show that when the filling height is 75 cm, the ore arching phenomenon under triple-outlet ore drawing is relatively obvious, and the arching strength is the highest. The location of arching is less affected by the ore drawing method, and obvious arching phenomena mostly occur at 55 cm above the ore outlet. Under the condition of triple-outlet ore drawing, the filling height further affects the formation of arching and the location of its occurrence. When the filling height is 85 cm, obvious arching phenomena occur at 55 cm and 75 cm above the ore outlet, and the ore in the lower area shows a tendency for arching. When the filling height increases to 95 cm, the area where obvious arching phenomena occur extends downward.
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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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