Full
Outline
Aiming at the problem of roadway stability during the collaborative mining of three middle sections of Jinchuan No.2 mining area, the maximum principal stress, roadway convergence rate, rock body integrity(Kv), rock quality (RQD), and support effectiveness were selected as evaluation indexes. Based on the combined weighting-boundary cloud modeling algorithm, the stability of the roadways during the collaborative mining of three middle sections in deep section was comprehensively evaluated and predicted, then compared with on-site working conditions. The results indicate that the stability grades of the roadways in the 1 018 m, 934 m, and 814 m sublevels across different mining phases primarily fall within grades Ⅱ to Ⅲ, but there are differences in the stability of the main roadways in each middle section. In current mining stage, the stability of the roadway in the 1 018 m sublevel is superior to that in the 934 m and 814 m sublevels, with the western and eastern areas of the 1 018 m sublevel exhibiting better stability than the central area. Conversely, the central and eastern areas of the 934 m and 814 m sublevels show greater stability than the western area. In the later stages of mining, the stability of the main roadway in each middle section gradually shifts from more stable to generally stable, resulting in a decrease in stability. The evaluation results align with the actual project, providing a reference for roadway support in the late stages of the collaborative mining of the three middle sections in Jinchuan No.2 mining 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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