Full
Outline
To meet the requirements during a 2-year transition period from open-pit to underground mining in Miaochong Iron Mine, its productivity continuity and mining stability were analyzed. Based on ore reserve estimation, Panel ① and Panel ② at the southern end of the roadway at midsection (370 m) of ore body are decided to be an initial mining plan for the transition period. Then, a model including ore bodies, rock formation, open-pit mine and underground roadways is built with FLAC3D software, which is then adopted to analyze the displacement, stress and plastic zone distribution characteristics of the open-pit and roadways at the midsection (370 m) during the transition period. The results show that the ore quantities in Panel ① and Panel ② at the midsection (370 m) during the transition period can ensure production capacity requirement, but also is sufficient for subsequent mining. It is found that the overall displacement of the open-pit and roadways at the midsection (370 m) is less than 5 mm, and compressive stress becomes dominant in the stress distribution, which is far lower than the stress resistance of the rock mass. There is no large-scale continuous plastic zone, indicating good stability and small impact by mining disturbance. In practical production, it is recommended that a segmented millisecond blasting should be adopted to achieve a staggered blasting operation between open-pit and underground mine. Besides, efforts should be intensified in monitoring open-pit slope and underground roadways to ensure safe production during the transition from open-pit to underground mining.
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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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