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Outline
The stability of exposed one-step filling body on both sides is the key to safe mining in the two-step mining of subsequent filling mine. By means of numerical simulation and field monitoring, the stress and displacement states of different positions under the condition of one-step filling body unilateral exposure in 5371 stope of an iron mine were studied. The results show that the vertical stress of the measuring point at the bottom of the exposed filling body changes the most, about 0.48 MPa. The horizontal displacement of the measuring point at the top and closer to the exposed surface is larger, and the maximum horizontal displacement is about 32 mm. The mining rate of the two-step pillar is logarithmically related to the maximum vertical stress and maximum horizontal displacement of the exposed filling body. Different excavation times have little effect on the vertical stress at the bottom of the filling body, which is about 1.92%, and have a great effect on the horizontal displacement of the top of the filling body, which is about 5.65%. The field monitoring results show that during the two-step mining, the vertical stress in the middle of the unilateral exposed filling body changes greatly, about 0.3 MPa, and the horizontal displacement of the top measuring point is the largest, about 30 mm, which is basically consistent with the numerical simulation results.The research results can provide safety guarantee for the two-step mining work of the iron mine.
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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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