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Outline
To address high cost of smooth blasting using detonating cords for mine's roadways, explosive train in blast hole with only one detonator was realized by taking advantage of sympathetic detonation (SD) of explosive. After performing experiments on SD with emulsion explosive in different charge diameters, with different charge weight and other constraint conditions, the SD distances under different conditions were obtained. The results show that SD distances of emulsion explosive with a charge diameter of 27 mm in a PVC tube and blast holes are 10 cm and 90 cm respectively, and constraint conditions have a significant impact on the SD distance of explosives. With the charge weight increasing from 150 g to 300 g, the SD distance is at least 5 cm longer, indicating the SD distance increases with the increase of charge weight. On the other hand, the charge diameter of emulsion explosive also exerts some impact on the SD distance. The SD distance of emulsion with a charge diameter of 35 mm in blast holes is 5 cm longer than that of the emulsion with charge diameter of 27 mm. Industrial experiments on blasting show that the roadway constructed by adopting sympathetic detonation can be well formed, which can not only meet requirements of the subsequent tunnelling in mine but also cutting blasting cost.
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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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