Full
Outline
In the 17# thick and large ore body of Zone Ⅲ at Yinman Mining, kaolinized fracture zones develop non-uniformly in the hanging wall and footwall, leading to a high risk of stope collapse and easy softening of the filling body. The conventional upward horizontal cut-and-fill mining method struggles to balance safety and economic efficiency. To address this issue, a progressive zonal cooperative mining concept of "central stable zone-peripheral fracture zone" was constructed. Five methods were employed to calculate the required filling body strength for different zones. Combined with three-dimensional numerical simulation, the effects of mining sequence, stope width, and safe exposure area on the stability of the surrounding rock and filling body system were analyzed. The results indicate that the alternating mining sequence of "extracting one leaving one" (Scheme 3) is the optimal option. This scheme can confine the high-risk plastic zone to approximately 5-7 m within the roof and control the single safe exposure area to approximately 300 m2. After adopting the zonal cooperative mining method, the daily production of stopes in the fracture-affected zone stabilizes at 390-400 t. The development ratio and cost per ton of ore are significantly reduced, and roof subsidence is controlled within a range of 30-40 mm. The production capacity of a single sublevel increases to 4 500 t/d, representing an improvement of 60.7%, while the filling cost decreases to 66.3 yuan/t, a reduction of 25.5%. Consequently, the zonal cooperative effects of "improving efficiency and reducing costs while controlling risks and enhancing stability" are achieved.
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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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