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Outline
In order to reveal the dynamic variation law of seepage field and stability of the dump slope under long duration rainfall, a case study of the dump in the Democratic Republic of the Congo was conducted. Based on the saturated-unsaturated soil mechanics theory, Geo-Studio software was used to simulate the seepage field of groundwater and perform the limit equilibrium analysis of the dump slope after long duration rainfall. The results show that the rainfall is mainly vertical infiltration in the initial stage, and it is mainly lateral infiltration in the later stage. The initial water level rises rapidly, and gradually decreases after 2 d of rainfall, and tends to be stable after 25 d. Under the condition of short duration rainfall, the safety factor of slope fluctuates whereas under prolonged rainfall, it initially decreases and then increases, and the minimum safety factor appears about 4 d after rainfall. The impact of rainfall on the stability of dump slope has a certain degree of persistence and hysteresis, and safety prevention and control measures should be taken for the slope with poor initial stability.
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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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