Full
Outline
Ensuring the stope stability is the foundation for the efficient and safe extraction of broken and thick ore bodies. Taking the mining of a broken and thick ore body in a certain mine as the engineering background, researches were conducted on optimizing the structural parameters of the stope during the orebody mining process using the downward wall filling mining method. The influences of drift dimensions, drift layout patterns, and filling frequencies on stope stability were analyzed in detail from three perspectives of principal stress, vertical displacement, and plastic zone. The findings indicate that the principal stress in the roof of the excavation zone exhibits an approximately uniform distribution, with the minimum principal stress showing tensile stress in the hanging wall and adjacent areas, while the maximum principal stress remains compressive. The central roof of the stope experiences the greatest settlement, while significant settlement is also observed in the hanging wall area, with no settlement but slight bulging in the footwall. The recommended optimal structural parameters are as follows, drift dimensions of 3.0 m×3.0 m, a vertical cross-shaped layout of drift, and a full-height filling process. Industrial trials demonstrate that this optimized solution can control the loss and dilution rate of the stope to approximately 5％, with mining costs maintained at 150 yuan per ton. The resource recovery efficiency and economic benefits are effectively enhanced, providing reliable technical support for subsequent safe and efficient mining operations in the mine.
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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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