Full
Outline
To realize safe and efficient mining in a copper-nickel mine in Xinjiang, a horizontal lateral medium-deep hole blasting mining technology was proposed. Firstly, blasting parameters are preliminarily determined by the empirical analogy method: the blast hole diameter is 65 mm, the minimum resistance line is 1.625-2.275 m, the hole spacing is 1.300-2.275 m, continuous in-hole charging is adopted, the unit explosive consumption is 0.35-0.5 kg/t, and the millisecond delay initiation interval is 25 ms. Interval stemming is adopted for blast holes, with stemming lengths of 1 m and 2 m respectively. Subsequently, the LS-DYNA finite element software was used to carry out numerical simulation analysis on horizontal lateral medium-deep hole blasting. The numerical simulation results show that rock can be effectively broken by blasting and the stability of backfill roof can be guaranteed when the minimum resistance line is 1.5 m and the hole spacing is 1.0-1.5 m. Finally, field verification tests were carried out. The results show that the shape of the drift stope after blasting is relatively regular. The predicted overbreak and underbreak volume is less than 10%, No oversize blocks or fine ore are generated, and the backfill roof remains intact, achieving favorable blasting performance.
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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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