针对突扩跌坎应用于高速泄流的深孔中其破坏原因众说不一的问题,通过对亭子口水利枢纽底孔突扩方案的三维数值模拟研究,分析了突扩跌坎型的压强分布、流速分布、底空腔和侧空腔的形态及整个流态分布,并进行了物理模型试验验证。结果表明,该突扩跌坎方案布局合理、有效,且物理模型试验与数值模拟结果吻合。 Aiming at the different causes of the failure of sudden expansion and contraction in the deep hole with high velocity discharge, the three-dimensional numerical simulation of the sudden expansion of the bottom hole in the Tingzikou water conservancy project is analyzed. , The flow velocity distribution, the shape of the bottom cavity and the side cavity and the distribution of the whole flow pattern, and verified by the physical model test. The results show that the layout scheme of this project is reasonable and effective, and the physical model test is in good agreement with the numerical simulation results.