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The phenomenon of mixed free-surface-pressure flow exists in the process of water level variation in the lower reservoir (roadway group) of mine-type pumped storage power station, which directly affects the operation stability of the system and the hydraulic safety of the roadway group. Based on 3D numerical simulation technology of hydraulic system, considering the three controlling cases including lower reservoir water filling, load rejection and pumping power failure, the characteristics of the transition process of water flow in roadway group and the evolution law of related hydraulic parameters were analyzed, and its influence on the hydraulic safety of roadway group was evaluated. The research shows that there is no obvious unfavorable flow pattern in the initial water filling process of the lower reservoir (roadway group); For load rejection with dead water level of the lower reservoir, the water level of the regulating pool decreases by less than 0.4 m, and for pumping power failure with the normal water level of the lower reservoir, the water level of the regulating pool increases by less than 10.0 m; The roadway group can enter and exhaust normally during the transition process, and the hydraulic transitions in the roadway section is smooth including the possible free-surface-pressure flow; The regulating pool and the ventilation channel meet the requirements of hydraulic optimization to ensure the hydraulic safety of the roadway group.
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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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