Full
Outline
After conducting fan-shaped medium-deep hole blasting in underground metal mines, a series of problems such as roof collapse, hanging roof, and high block rate are prone to occur, which have certain safety hazards and high costs of secondary crushing. It is necessary to optimize the hole network parameters of the fan-shaped medium-deep hole blasting in order to ensure the uniformity of blasting blocks and the safety of the blasting operation surface. Based on the analysis of the blasting funnel test results for a fan-shaped medium-deep hole blasting with a diameter of 89 mm in a Russian mine, the reasonable ranges of hole network parameters were determined as follows, hole bottom distance of 2.8−3.2 m and row spacing of 2.3−2.5 m. Subsequently, ANSYS/LS-DYNA numerical simulation software was used to calculate and analyze the blasting models with different hole bottom distances, and the optimal hole bottom distance was determined to be 2.6−2.8 m. The optimized hole network parameters were used for on-site industrial testing, and after blasting, the fragmentation of the mining area was uniform, the roof stability was good, and the overall blasting effect was good.
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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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