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Outline
To reveal the influence of aftershocks on the failure process of gravity dams, the Jinanqiao gravity dam is chosen to perform the investigation. The impact of reservoir water was simulated by using Westergaard additional mass. The elastoplastic damage model was adopted to simulate the nonlinear characteristics of the concrete material of the dam body, and the nonlinear failure process of the dam body under the action of a single main shock and main aftershocks was calculated. The results show that the failure pattern of the dam body under the main aftershock is consistent with that under the single mainshock. The failure areas are mainly concentrated at the dam heel, the upstream and downstream folded slope, and the downstream dam surface. The aftershock effect will cause the further development of the main earthquake damaged area and significantly increase the cumulative plastic dissipation energy of the dam body. The cumulative plastic dissipation energy caused by aftershocks gradually increases with increase of the PGA. After the PGA reaches 0.45g, the contribution of aftershocks to the cumulative plastic dissipation energy gradually stabilizes at around 30%. In terms of seismic performance, the ultimate seismic bearing capacity of the dam body is in the range of 0.50g and 0.55g under the action of a single main shock, while under the action of the main aftershock, it decreases to 0.40g-0.45g.
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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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