Full
Outline
Aiming at the problem of the safe thickness of the isolation layer in an iron mine from open-pit to underground mining, the technical means combining theoretical calculation and numerical simulation was adopted to analyze the influence characteristics of the underground ore body mining process on the surface settlement and rock movement under the condition of different thickness isolation layers. The results show that the safe thickness of the isolation layer of the iron ore is from 11.25 m to 24.41 m based on the theoretical calculation method. The numerical simulation results show that when the thickness of the isolation layer is 15 m, 20 m and 25 m, the surface settlement displacement of the surface structures, the open-pit slopes and the dump sites are all small, which can meet the stability evaluation standard of the rock mass. Considering the safety of mining and avoiding the loss of mineral resources, the safety thickness of the isolation layer is recommended as 20 m. After the implementation of the plan, it is expected that the comprehensive production capacity of the mine will increase by 20%, the safety accident rate will decrease by 53%, it has advantages in terms of safety reliability, technical feasibility and economic rationality. The study can provides an important reference for similar mines to conduct 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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