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Earthquakes are one of the main causes leading to dynamic instability of tailings dams. Based on the pseudo-dynamic method combined with the Swedish arc method, the evaluation indexes of dynamic stability of tailings dams can be quickly determined. To improve the computational efficiency of the pseudo-dynamic method in the evaluation of slope earthquake stability, a separated critical initial phase search strategy was introduced, and a fast pseudo-dynamic method was proposed. The traditional pseudo-static method, the pseudo-static method considering the amplification factor, and the fast pseudo-dynamic method were applied respectively to evaluate the seismic stability of a tailings dam in Xizang from two angles of safety factor and failure probability. The results of numerical analysis show that the safety factors obtained by above three methods all meet the minimum stability requirements. In the view of the safety factor and the sliding area comprehensively, the results obtained by the pseudo-static method considering the amplification factor tend to be conservative. The influence of P-wave velocity on the calculation results is small. With the increase of S-wave velocity, the safety factor obtained by the fast pseudo-dynamic method gradually decreases, the failure probability gradually increases, the number of instability sliding surfaces gradually increases, and the risk sources of earthquake instability of tailings dams increase. The research results have a guiding significance for the evaluation of earthquake stability 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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