Full
Outline
To determine the safety pillar thickness and predict dangerous slopes for a mine in transition from open-pit to underground mining, numerical simulation was conducted based on Rhino and FLAC3D software to analyze the safety pillar thickness, the reliability of the mining method, and the slope safety factor after the completion of underground mining. Firstly, the underground mining method was selected based on the occurrence characteristics of the orebody, then, a simplified stope model was established according to the selected mining method, and a relatively conservative safety pillar thickness was determined. Subsequently, the stope was further divided through refined modeling to verify the reliability of the selected mining method. Finally, the potential dangerous slopes were identified using the strength reduction method, and the slope safety factor after the completion of underground mining was determined. The results show that a 30 m thick safety pillar can ensure safe production during underground mining. After the completion of underground mining, the panel remains generally stable, and the selected mining method is reasonable and reliable. The slope safety factor after underground mining is 4, and the relatively dangerous slope is located on the northern side of the central part of the final pit boundary.
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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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