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Outline
Drainage well is an important safety facility in tailings pond, its stability is related to the safety of tailings pond. Based on the similarity principle, the dynamic response characteristics and variation law of the drainage wells in tailings pond under different seismic accelerations and different buried depths were systematically studied by shaking table test. The results show that when the peak seismic acceleration increases from 0.315g to 1.5g, the acceleration amplification coefficient in the drainage wellbore increases first and then decreases, and the well wall gradually changes from elasticity to elastoplasticity, and the stiffness gradually decays. Under the action of 1.5g peak seismic acceleration, the maximum relative displacement of the drainage well under the full-buried condition is 0.967 mm, which is much smaller than that under the non-buried condition of 5.295 mm, indicating that under the action of seismic, the tailings around the drainage well play a stabilizing role in the drainage wellbore, and the seismic performance of the drainage well is improved. In the process of increasing the peak seismic acceleration from 0.315g to 1.5g, the first-order frequency of the drainage well under the non-buried, semi-buried and full-buried conditions decreases by 29.17%, 27.05% and 22.74%, respectively compared with the initial natural frequency, and the stiffness of the drainage well degrades fastest under the non-buried condition. Under the action of seismic, the strain peaks at different positions in the wellbore are positively correlated with the peak seismic acceleration. The maximum strain value appears at the bottom of the drainage well, indicating that it is most vulnerable to vibration damage. The seismic performance of the bottom of the drainage well should be enhanced in the design.
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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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