巴基斯坦水电站泄洪建筑物布置及消能形式研究

Study on layout and energy dissipation form of flood discharge structure for hydropower station in Pakistan

巴基斯坦水电站工程具有泄流量大、泥沙量大、库容小、地质条件复杂、消能区岩体抗冲能力较低的特点。结合工程区的地形、地质条件、水文特性、水库调度特点,文中介绍了采用溢流表孔和泄洪排沙孔联合泄洪,泄洪排沙孔集中布置的泄洪建筑物布置方案,并对消能形式进行对比研究,采用溢流表孔宽尾墩+底流消能+泄洪排沙孔底流消能组合,经水工模型试验研究验证,总体上适应该工程的特点。

The hydropower station project of Pakistan has the characteristics of large discharge flow, large sediment volume, small storage capacity, complex geological conditions and low anti-erosion capacity of rock in the energy dissipation area. Combining with the topography, geological conditions, hydrographic characteristics and reservoir scheduling characteristics of the project area,the paper introduces the layout scheme of the flood discharge structure with the combined flood discharge of overflow surface hole and flood discharge and sand discharge hole and the concentrated arrangement of flood discharge and sand discharge holes, compares and studies the energy dissipation forms, then the dissipation combination are adopt, including the flaring gate piers of overflow surface hole, energy dissipation by hydraulic jump and the energy dissipation by hydraulic jump of flood discharge and sand discharge hole.The hydraulic model test results show that it is generally suitable for the characteristics of the project.