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Outline
Taking a copper mine as the engineering background, optimization research on the parameters of stope mining drifts was carried out to realize the safe and efficient mining of horizontal pillars in underground mines and ensure the stability of stopes. Based on the structural mechanical model of simply supported beam, the law of tensile stress of drift roof varying with drift width was analyzed, and the drift width and reserved roof thickness were initially determined. Further, FLAC3D numerical simulation was used to compare the influence of drift width on the overall stability of stope under different reserved roof thicknesses. The results show that based on the structural mechanical model of simply supported beam, the optimized structural parameters of the drift are a reserved roof thickness of 2 m and a drift width of 4 m. Taking Scheme 3 (drift width of 3.5 m, drift height of 4 m) as an example, theoretical calculation shows that the maximum tensile stress of its roof is 0.37 MPa, and the safety coefficient reaches 1.86.In the numerical simulation, the maximum tensile stress is 0.49 MPa, the stope roof displacement is small, the roof basically does not undergo plastic failure, and the structure remains stable. The method combining the simply supported beam theory and numerical simulation can accurately predict the load changes and stress distribution in the mining of horizontal pillars, and provide a basis for the optimization of structural parameters of mining drift for similar mine projects.
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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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