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Outline
The blasting quality of fan-shaped blasthole has a significant effect on the application effect of non-pillar sublevel caving method. In view of the problems such as serious damage of eyebrow line, uneven blasting fragmentation and large loss and dilution when the non-pillar sublevel caving method was used in the west second mining area of Longshou Mine under the condition of ore-rock breaking, ANSYS / LS-DYNA was used to optimize the charge structure parameters of the fan-shaped blasthole. The results show that the blasting effect of fan-shaped blasthole can be effectively improved using W-type staggered charge at orifice, hole bottom initiation and millisecond blasting in row. The optimized blasthole charge structure parameters are applied to the field production practice. The ore recovery rate is increased by about 36%, the ore dilution rate is reduced by about 31%, the bulk rate is reduced by 52%, and the damage of the eyebrow line is also significantly reduced.
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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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