故县水库泄洪底孔的体型设计

Configuration Design of Discharge Orifice of Guxian Reservoir

本文介绍了高水头混凝土坝泄洪底孔的体型选择及试验研究，选定了斜坡式体型布置。通过空穴特性分析，为保证运行安全，对水流空穴数小于０．３的部位，除严格控制体型和平整度外，文中提出采用两道通气减蚀措施。经通气减蚀试验，确定了通气措施的各项参数。该底孔已建成运行，经初期运行，未见异常。

The article presents the configuration determination and test research on discharge orifice of high waterhead concrete dam. The slope type configuration arrangement is determined. To gUarantee the operation safety,besides using the method of configuration and levelling control in the orifice section where the flow cavitation numberis below 0. 3, through cavitation characteristics analysis, the measure of two - ways air ventilation cavitation resistance is presented in this article. All parameters of ventilation measure are determined through ventilation cavitationresistance test. This constructed discharging orifice has been put into operation, being in normal working mode in itsinitial operation stage.