旋流式竖井泄洪洞是导流洞改建为泄洪洞的一种有效方式，采用消力井衔接竖井与导流洞，具有体形简单、安全可靠等特点，但其体形对导流洞的水流流态有直接影响，是优化研究的重点之一。为此，在《小湾水电站大型导流洞改建泄洪洞研究》的基础上，针对小湾水电站水头高、流量大的泄洪特点，通过试验研究，对比分析了不同井深方案消力井底板冲击压强的分布特性和井深对消能率的影响，提出消力井的合理井深为竖井直径的0.7～1倍。%The flood-releasing tunnel with rotation-flow vertical shaft is an effective way for reconstructing diversion tunnel into flood-releasing tunnel. The adoption of stilling well to connect vertical shaft with diversion tunnel has the characteristics of simplicity of its shape, safety and reliability. As its shape could bring direct impact on the flow patter of diversion tunnel, it is listed as one of key subjects of optimal study. On the basis of the study on how to reconstruct the large-sized diversion tunnel into flood-releasing tunnel for the Xiaowan Hydropower Station and in accordance with the flood-releasing characteristics of high head and large discharge of the Station, we test, research and analyze the distribution features of pulse pressure intensity in the bottom slab of stilling well for different well depths and the impacts of well depth on energy dissipation rate. We consider that the rational depth of stilling well should be 0.7～1 times diameter of well.
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