Full
Outline
To address the challenges such as potential large-scale surface subsidence caused by mining the hung-up orebody in the triangular ore belt of a certain silver-lead-zinc mine, two overall mining sequence plans were proposed based on the site engineering geological conditions. Plan I involves treating the goaf and hung-up ore zone prior to ore extraction, while Plan II involves extracting the ore first followed by treatment of the goaf and hung-up ore zone. A geological model was constructed by combining CAD, 3DMine, and MIDAS, and numerical simulation was subsequently employed to compare the distributions of the stress field, displacement field, and plastic zone at various mining stages for these two plans. The results indicate that Plan I is more favorable for controlling ground pressure and ensuring stability in both the stope and the hung-up ore zone during mining operations, while also reducing resource wastage. Based on the numerical simulation results and mining technical conditions, a coordinated mining scheme involving the initial construction of an artificial false roof (and floor) followed by extraction from the bottom was proposed, and the construction scheme for the artificial false roof (and floor) was determined. A prediction model for the settlement of the artificial false roof was developed using the random forest algorithm to continuously ensure the safety of hung-up ore extraction in the area. The results of the industrial-scale trial show that the extraction rate of the hung-up ore exceeds 80%, generating approximately 5 million yuan in profit.
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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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