石门坎水电站拱坝泄洪消能水工模型试验研究

Flood Discharging and Energy Dissipation Hydraulic Model Test and Study of the Arch Dam for the Shimenkan Hydropower Project

为了弄清石门坎水电站拱坝泄洪消能的能力,通过拱坝泄流能力水工模型试验,分别模拟3个表孔和两个中孔单独或表孔、中孔联合运用条件下泄流能力、出口流速、压力分布及消能冲刷情况。以验证原设计方案中表孔、中孔体型设计是否合理,从而最终确定表孔、中孔的设计体型。模拟泄洪过程中消力池底板的受力情况变化,根据受力情况提出改善措施,防止发生揭底破坏。对泄洪的雾化问题进行简单分析,提出意见。

In order to gain a clear idea of the capability of flood discharging and energy dissipation of the arch dam of the Shimenkan hydropower project, a hydraulic modal test of arch dam flood discharging capability was made to simulate flood discharging capab＇dity, outlet flow velocity, pressure distribution, energy dissipation and erosion under individual operation of 3 crest outlets and 2 intermediate outlets or under joint operation of a crest outlet and an intermediate outlet, so that the shapes and con_figurations of the crest outlets and the intermediate outlets in the original design could be verified and finalized. The change of pressure applied on the plunge pool bottom plate during flood discharging was simulated and necessary measures were taken to protect the bottom plat from damage according to the simulation result. A simple analysis was made of atomization caused by flood discharging, and comments on improvelnent were put forward.