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The stability of tailings dam is directly related to the safety of the surrounding environment and personnel. Rainfall is an important factor affecting the stability of tailings dams. Under different rainfall conditions, the hydrological, mechanical and deformation characteristics of tailings dams will change significantly. The mechanical parameters and permeability coefficient of each soil layer of the tailings dam were determined by laboratory tests. Combined with the simulation analysis of pore water pressure distribution and seepage characteristics under rainfall conditions, the stability of tailings dams under different rainfall intensities and rainfall durations was studied. The results show that the greater the rainfall intensity and the longer the duration, the wider the depth and range of water infiltration, and the more obvious the change in the stress distribution inside the dam body, thus affecting the overall stability of the dam body. Rainfall will not only increase the humidity of the surface layer of the tailings dam, but also increase the pore water pressure of the soil. It will also weaken the shear forces between the layered structures of the dam body, increase the risk of dam instability, and thus reveal the instability mechanism of the tailings dam under rainfall. The research results provide a reference for the design and risk assessment of tailings dams.
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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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