Full
Outline
In view of the following mining technical challenges in underground mine operations: some stopes are laid out within the broken oxidation zone, giving rise to roof caving and sidewall collapse during production, in addition, ore caving trenches are reserved at the bottom of sublevel medium-deep hole stopes to facilitate ore drawing, which results in the failure of effective recovery of the triangular ore pillars at the stope bottom after mining completion due to the poor quality of backfill materials, thus causing enormous waste of mineral resources. A polymetallic mine was selected as the research object, through field investigation, theoretical analysis and reference to the experience of similar mines, a combined support scheme of shotcrete-bolt-mesh with long anchor cable grouting was proposed to pre-reinforce the roof of the stope to ensure the safe mining of ore in the range of broken oxidation zone. Meanwhile, the medium-deep hole blasting technology was optimized, and the goal of non-trench simultaneous row recovery of bottom pillars was achieved by supplementing short holes. The industrial test results show that after the adoption of the optimized scheme of "pre-controlled roof reinforcement + supplementary short-hole simultaneous row recovery of bottom pillars", the stope roof stability and ore resource recovery rate are significantly improved, the comprehensive production capacity of stopes increases by 21.54% compared with the original scheme, and the loss rate and dilution rate are reduced to 8%, which can be popularized and applied in the underground production area.
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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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