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该文针对华安水电站扩建工程调压井因所处位置地形狭窄、地质条件复杂而不利于大直径调压井开挖的问题,经过渡过程仿真计算,将调压井直径由托马断面的29.5 m优化为20 m,开挖直径由33.5 m减到23 m,降低了施工难度,节省了工程投资,确保了工程顺利实施。实践表明,当水电站并在大网中运行时,在充分考虑系统、水轮机内部水流稳定性、调速器性能和安装调试质量等因素影响作用下,调压井稳定断面小于托马断面是可行的。
In view of the narrow terrain and complicate geological conditions in the surge shaft of Hua’an Hydropower Station expansion project, which is unfavorable to the excavation of large diameter surge shaft, the diameter of the surge shaft is increased from 29.5 m is optimized to 20 m, the excavation diameter is reduced from 33.5 m to 23 m, the construction difficulty is reduced, the project investment is saved, and the smooth implementation of the project is ensured. Practice shows that when the hydropower station is operating in a large network, it is feasible to consider the steady flow cross section of the surge shaft less than the Toma section under full consideration of the influences of the system, the flow stability inside the turbine, the performance of the governor and the quality of the installation and commissioning. .