Full
Outline
In order to solve the problem that the minimum buried depth of the phreatic surface in a uranium tailings dam is less than the code limit due to complex depositional structures and insufficient drainage facilities in the tailings dam, the numerical analysis on seepage and stability of the tailings dam were conducted by GeoStudio. The variation patterns of phreatic surface and factor of safety under normal, design, special water levels, with/without drainage consolidation measures, were systematically investigated. The results show that before the drainage consolidation measures were taken, the minimum buried depth of the phreatic surface is 1.74 m, 0.93 m, and 0 m under normal, design, and special water levels, respectively. Especially under the special water level, the phreatic surface emerged from the embankment above the 140.9 m platform. The factor of safety was 1.329, 1.321, 1.291 respectively before the drainage consolidation measures were taken. After setting up the horizontal drainage pipe as drainage consolidation measures, the phreatic surface burial depth increased by 3.48~4.59 m, while factor of safety at normal, design, special water levels rose to 1.431, 1.425, 1.402 respectively, with an increase of 7.68%~8.59%. The drainage consolidation measures can effectively optimize seepage conditions of the embankment, significantly reduce the phreatic surface elevation, and enhance dam stability, confirming satisfactory seepage control effectiveness. The results provide strong technical support for the design of drainage consolidation measures in tailings dams and offer valuable references for ensuring long-term safe operation of tailings ponds.
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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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