Full
Outline
The difficulty of controlling the blasting effect of fan-shaped blasting holes in the non-pillar sublevel caving method significantly affects the mining efficiency in the mining area. Research was conducted on the issues of high large block rate and poor ore recovery index as well as poor safety of mining operations in the 1 580 m sublevel caving stope under the condition of broken ore-body in the west No.2 mining area in Longshou Mine. The analysis shows that the main reason of the high block rate is that the side holes in upper sublevel edge are buried by the blasting pile and not fully blasted, and the serious blockage of the blasting row holes in this section results in insufficient charging. Analysis shows that a high block rate can have adverse effects on the mining indicators, operational safety, mining efficiency, and mining costs of the mining area. In order to reduce the large block rate in the mining area, a series of technical and management measures were proposed, including optimizing the form and size of the mining drift, improving the parameters of fan-shaped blast holes, introducing through hole equipment suitable for the working environment, testing pre-charge technology, and strengthening blasting quality management. The large block rate in the mining area has been successfully reduced from 16％ to 5％, the ore recovery index in the mining area has been increased from 68％ to 82％, and the safety of the mining area has been significantly improved.
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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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