Full
Outline
The ore body above 180 m level in the west section of Dahongshan Copper Mine belongs to the gently inclined medium-thick ore body, which was originally mined by the point-column upward horizontal slicing-and-filling method. However, with the continuous expansion of the mining scope and level, the stress concentration around the mining zone became increasingly evident, the unmined areas and the stope were located within the stress concentration zone and the plastic zone, leading to a growing safety risk for the roof. According to the characteristics of ore body and the actual situation of the site, the optimization study of mining in transition area between two minging schemes was carried out. After optimization, the transition area was mined using the sublevel open stoping with subsequent filling method, and cemented backfilling was employed to construct cemented ore pillars in the transition area. Analysis and study on the layout of mining preparation projects in the transition area under two mining schemes were carried out. The results show that the transition area is mined by sublevel open stoping with subsequent filling method, and the cemented pillar formed by cemented filling has a good supporting effect. The maximum plastic zone height of stope roof is 7-8 meters, and the layout of the filled return airway is not affected. The application effect shows that the stope in the transition area remains stable overall, achieving safe and efficient resource recovery in the area.
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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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