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Outline
To address the problem of a large amount of overlaid ore by the shaft safety pillar in a gold mine, numerical simulation calculations method were carried out to analyze the influence of different delineation angles of the safety pillar on the stability of the shaft and surrounding rock, and the safety pillar range was re-delineated. The numerical simulation results show that the influence of mining of No.13 ore vein of the mine on shaft stability increases with the increase of the delineation angle of the safety pillar. When the delineation angle of the safety pillar exceeds 75°, ground pressure behavior is significantly intensified, and there exists a risk of shaft instability, especially after the stoping of deep stopes. Therefore, it is recommended that the delineation angle of the safety pillar be controlled at 75° and below to ensure the safety of the shaft. When the delineation angle of the safety pillar is increased from 65° to 75°, the volume of overlaid ore in the safety pillar is reduced from 1 192 955.0 m3 to 545 256.7 m3.About 54.3% of ore resources can be released, which improves the utilization rate of mineral resources and is conducive to the sustainable development of the mine.
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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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