Full
Outline
After a certain iron mine in Henan Province was mined by sublevel caving method, due to the lack of forced caving measures, the thickness of the upper overburden strata became insufficient as the stope advanced to depth, resulting in the collapse of the goaf roof and the remaining point pillars from the original room-and-pillar method in the -40 m sublevel, which seriously threatened the safe mining of the stope. Using Mathews stability graph method and numerical simulation, the stability of the goaf was analyzed and studied. It was found that there was a large area of caving risk in the roof of the goaf. Therefore, it was suggested that the -72 m sublevel stop using the caving mining method, that the area above -72 m should be sealed off, and the area above -90 m should be mined by the filling mining method instead. Considering the mining conditions of ore body and the production capacity requirements of the mine, three technically feasible mining schemes were proposed: the sublevel open stoping with subsequent backfill method, the panel mechanized upward horizontal cut-and-fill stoping method, and the upward horizontal cut-and-fill stoping method perpendicular to the orebody strike. Taking into account the technical and economic indicators and mining safety, it was recommended that the mine adopt the panel mechanized upward horizontal cut-and-fill stoping method. After the mine transitioned from the caving mining method to the filling mining method, the ore dilution rate decreased to 10%, the loss rate decreased to 8%, and the development-to-production ratio increased to 7.47 m/kt. The annual output met the mine's design and production requirements, and within the remaining service life, the mine economy benefit could increase by 49.476 7 million yuan.
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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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