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Outline
Aiming at the stability control of surrounding rock in gently inclined orebody stopes and safety risks of surface waste dumps under the coupling effect of surface load and mining disturbance, mechanical parameters of key rock strata were measured via indoor rock mechanics tests. Combined with physical similarity simulation adopting Digital Image Correlation (DIC) technology and three-dimensional numerical simulation, fracture evolution features as well as response laws of stress and displacement fields of stope surrounding rock under dual disturbance were systematically analyzed. Test results show that mining disturbance induces stress redistribution in surrounding rock. Superimposed surface load increases the maximum vertical displacement of stope roof directly beneath the waste dump by 12.86%, and a subsidence center consistent with the theoretical boundary of mining pressure relief arch forms on the surface. Tensile stress concentrates in the roof, floor and upper surrounding rock of the stope, while compressive stress concentrates in inter-level roof and floor pillars. Backfill mining weakens stress concentration and deformation transmission, reducing the compressive stress on inter-level roof and floor pillars by 61.67% and roof tensile stress by 10%-15%. It effectively alleviates the unloading effect and improves the stability of stope-surface system. Field monitoring verifies the effectiveness of the adopted stability control measures, providing a scientific basis for safe mining of similar surface structure-stope coupling systems.
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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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