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Outline
As a transition scheme between open pit mining and underground mining, hanging wall ore mining is of great significance to ensure the seamless connection of mine in time, space and yield. The hanging wall ore body in the western area of Luodang mining area was taken as the research object. In view of the complex geological conditions that the ore body is located under the high slope and adjacent to the open-pit transportation system, the two-step strip upward horizontal layered filling mining method was adopted. FLAC3D numerical simulation software was used to simulate and analyze the stability of stope, slope and open-pit transportation system in the process of mining. The results show that when the mining method is used to mine the hanging wall ore body, the plastic zone range and the maximum displacement of the stope roof are 3.4 m and 6.6 mm, respectively, and the plastic zone range and the maximum displacement of the slope and open-pit transportation system are 9.5 m and 5.8 mm, respectively. The maximum tensile stress of the stope, slope and open-pit transportation system is 1.2 MPa, and the overall stability is good. In the process of hanging wall ore mining, there is a significant negative correlation between the stope-slope distance with the stability of the stope. The research can provide theoretical reference for the mining of hanging wall ore bodies in similar mines.
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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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