Full
Outline
Aiming at the extraction challenges of high-grade ore bodies in deep fractured surrounding rock, the applicability of the drift filling mining method was explored using a copper-gold mine as the engineering background. Through core sampling, uniaxial compression and Brazilian splitting tests, combined with the Hoek-Brown and Mohr-Coulomb strength criteria, the key mechanical parameters of the surrounding rock and backfill were obtained. Subsequently, numerical simulations on overhand and underhand drift filling mining methods were conducted to analyze the displacement characteristics of the surrounding rock under corresponding support conditions, and scheme optimization was achieved by integrating technical and economic indicators. The results indicate that the overhand drift filling mining method is applicable to ore bodies with good to moderate rock mass stability, whereas the underhand drift filling mining method is more suitable for ore bodies featuring extremely fractured and highly unstable rock masses. For both drift filling mining methods, the total displacement of the surrounding rock remains relatively small; however, the displacement distributions differ due to variations between the roof and the floor. An economic comparison reveals that the underhand drift filling mining method incurs higher mining and filling costs (4.01 yuan/t higher than the overhand drift filling mining method), while its support costs are lower (0.313 yuan/t lower than the overhand drift filling mining method). Based on a comprehensive evaluation, the overall application of the overhand drift filling mining method is recommended, with the underhand drift filling mining method reserved exclusively for localized areas containing highly fractured surrounding rock.
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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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