Full
Outline
The Xitieshan lead-zinc mine has left a large amount of high-grade ore pillar resources after years of mining, and there is an urgent need to recover the top and bottom pillars in a safe and efficient manner. It is found that the strength of underground filling body can't meet the conditions for large-scale exposure in the bottom pillar mining area through on-site sampling and strength testing of the filling body above the bottom pillar, and it is necessary to leave roof protection pillars. Based on the test results, three technically feasible mining schemes were proposed, including the joint mining method of sublevel open stoping with subsequent filling and upward access empty field, mining method of false roof and segment subsequent filling, as well as mining method of pre-controlled roof and downward medium and deep hole segment subsequent filling. A comparative analysis was conducted on the advantages, disadvantages, and technical and economic indicators of the three mining methods. Finally, the the joint mining method of the segmented subsequent filling and upward access was selected. Numerical simulation was used to determine that the medium deep hole mining area adopts the mode of mining one with two intervals, and in a sequence from both sides to the middle, and a backward extraction method was used to extract partially pillars during the mining process of the access. The on-site application results show that this scheme has good safety and adaptability in the mining of top and bottom pillar resources, with a comprehensive recovery rate of 70％, achieving efficient recovery and utilization of top and bottom pillar resources.
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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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