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Outline
To address the challenges of slope stability and ground pressure control during the transition from open-pit to underground mining in Jinchuan Longshou Mine, the stress evolution and plastic zone variation laws of the open-pit slope and orebody surrounding rock during underground stoping and backfill process were analyzed with numerical simulation. The results show that:Underground mining leads to the formation of an elliptical subsidence area on the surface of the open pit, where the subsidence displacement is positively correlated with the mining depth, and the maximum subsidence displacement reaches 1.53 m; underground stoping induces a significant redistribution of the secondary stress field, with the compressive stress in the bottom area of the open pit decreasing from 2.0 MPa to 0.1 MPa, forming a low-stress relaxation zone penetrating to the surface; the plastic zones are mainly distributed at the bottom of the open pit and the toe of the south slope, while the backfill body effectively restricts the plastic zone from extending deep into the slope, and there is no penetrating plastic zone inside the slope body, indicating the overall stability of the slope. In the subsequent deep mining process, it is recommended that microseismic monitoring and multi-point displacement observation should be strengthened in areas with developed plastic zones. Meanwhile, the backfill roof-contact rate should be strictly controlled to prevent local surrounding rock caving from inducing slope instability.
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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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