Full
Outline
There are many residual pillars and top pillars under the condition of filling body enveloping in a high-grade iron mine. In order to recover high-grade iron ore resources as much as possible, a recovery scheme of residual pillar and top pillar was studied. Comparative analysis of the technical and economic indexes between the downward drift filling mining method and the sublevel filling mining method was conducted. And the sublevel filling mining method with simple mining process, high mining intensity and low production cost was selected as the best mining method for residual pillar recovery. Based on the selected mining method, numerical simulation was used to analyze the displacement, stress, and plastic zone distribution of the surrounding rocks and filling materials in the mining area under different structural parameters of mining room. Optimization research was conducted on the structural parameters of mining room under the mining of the 606# inter pillar and the top pillar at －525 m sublevel. The simulation calculation results show that the optimal structural parameter scheme for the mining room under the recovery of 606# inter pillar is a mining room length of 30 m without leaving a top pillar. The maximum displacement of the mining room roof in this scheme is 50.00 mm, and the volume of plastic zone of roof is the minimum, which is 1 534.55 m3. The optimal structural parameter scheme for the mining room under the recovery of top pillar is that the spans of the first and second step mining rooms are 8 m and 10 m, respectively, and the length is 25 m. The maximum displacement of the mining room roof in this scheme is 57.64 mm, and the volume of the plastic zone per unit area of the roof is small, which is 1.02 m3. There is no obvious connection in the plastic zone of the filling body inside the mining area.
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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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