Full
Outline
To address the influence of blasting fragmentation size on the comprehensive production costs of drilling, blasting and loading haulage in underground metal mines, 15 large-diameter long-hole stopes of a lead-zinc mine were taken as the research object. Based on measured blasting fragmentation size and production costs over the same period, a coupling model of direct operation costs of drilling-blasting-loading haulage was constructed, and sensitivity analysis and field industrial tests were conducted for verification. The results show that the comprehensive cost first decreases and then increases with the increase in average fragmentation size. The economic optimal fragmentation size is 24.99 cm, corresponding to a comprehensive direct operation cost of 7.501 yuan/t. When the explosive consumption per unit and blast hole pattern parameters are respectively perturbed by ±10%, the optimal fragmentation size remains within the range of 23 to 27 cm, and it is recommended to take 25 cm as the design target for on-site blasting fragmentation. Compared with the reference fragmentation size of 32.2 cm predicted by the Kuznetsov model, the predicted cost corresponding to the model's optimal fragmentation size is reduced by 3.09%. The average fragmentation size in the field test is 246.5 mm, which is 10.1% lower than that of the comparison stope, and the proportion of blocks larger than 600 mm decreases from 10.33% to 5.48%. The model is applicable to mines with similar geological conditions, mining methods, and equipment configurations, and its results only reflect the direct operation costs of the three processes of drilling, blasting and loading haulage.
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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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