Full
Outline
In order to improve the utilization rate of point pillar resources in Xianglushan tungsten mine and control the impact of point pillar mining of shallow buried depth, analysis was conducted on the technical conditions for mining the underground residual pillars. Combined with the current common point pillar mining schemes and selection principles to determine two filling and mining schemes suitable for point pillar in Xianglushan tungsten mine of shallow buried depth. Furthermore, numerical simulations were conducted to calculate and analyze the displacement and plastic failure of each scheme at burial depths of 50 m, 100 m, 150 m, and 200 m. At the same time, to reduce the impact of underground blasting vibration on ancient buildings, the relationship between the maximum allowable single section dosage and the distance for underground blasting was calculated. Finally, industrial tests were conducted in the 610 mining area of Xianglushan Tungsten Mine to verify the mining scheme. The research results show that during the implementation of the mining scheme, there is no significant change in ground pressure and displacement monitoring data, and the stability of the goaf is good. The total amount of extracted ore is about 21 000 t, and the residual ore recovery rate within the height of the goaf in the mining area reaches about 38.33%, achieving good economic benefits.
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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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