Full
Outline
In order to select the best filling mining scheme and to optimize stope structure parameters of a high-value iron deposit, combined with the mining technical conditions of the deposit in the stage of −120 m to −180 m, the selection of mining scheme was regarded as a typical fuzzy decision problem. The analytic hierarchy process was used to obtain the weights of 11 indexes, and the fuzzy mathematics was used for comprehensive evaluation. The mining scheme of this iron deposit was selected as the sublevel drilling stage open stoping with subsequent filling method. Based on numerical simulation, four groups of stope structural parameters of the preferred mining scheme were optimized. The simulation results are concluded as follows. Firstly, in the process of mining, the tensile failure of each scheme is obvious, and the stress concentration occurs at the junction of the pillar and the roof. The maximum horizontal displacement of the central monitoring point at two sides of the stope and the maximum vertical displacement of the central monitoring point at the roof are 9.4 mm and 9.6 mm, respectively. Secondly, in the process of pillar mining, the shear failure of each scheme is obvious, and the maximum vertical displacement of the stope roof center in scheme Ⅱ is 28.0 mm. From the perspective of safety and economy, the optimal stope structure parameters of an iron mine are 15 m room width and 15 m pillar width. The scheme and the optimized stope structure parameters have achieved good economic benefits in mine production.
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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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