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Outline
The stope structure parameters of the mine are important factors to ensuring safe and efficient mining. With the background of the No. I ore body of a copper mine in Yunnan Province, four different point pillar sizes were proposed by engineering analogy method. And the displacement and stress of the stope under different point pillar sizes were analyzed by FLAC3D numerical simulation software. The results show that when the excavation is to the fourth layer, the 4 m×6 m and 5 m×5 m point pillar size schemes can withstand the maximum tensile stress beyond the mining site, and the two schemes can be excluded. The tensile stress of mining sites with 5 m×6 m and 6 m×6 m point pillar size schemes has not reached the limit state, but the optimization effect of rectangular point pillar is obviously better than that of square point pillar. Finally, the reasonable size of point pillar has been determined to be 5 m×6 m, which can provide a reference for mine stope test.
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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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