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该文基于过水围堰混凝土楔形护板溢洪分析,提出在尾部设置平台形成挑压坎楔形护板。采用紊流数值模拟方法,对挑压坎楔形护板水力特性进行了研究,并与一般楔形护板对比分析。研究表明:挑射流可以提高堰面的消能效果,特别在小洪水工况时改善较为明显;冲入消能平台的流速有所降低,可减小水流对堰脚的冲刷;水流经挑压坎以平抛射流的形式向下弯曲,能增加水体作用于下一级护板的稳定力。一般楔形护板只在首部附近出现一个压力最大值,挑压坎楔形护板首、尾各有一个压力峰值,可以改善护板的受力条件,有利于过水围堰的整体稳定。
Based on the spillway analysis of concrete wedge guard of over-water cofferdam, the paper proposes to set up the platform to form the pick-up wedge wedge guard at the tail. The turbulent numerical simulation method was used to study the hydraulic characteristics of the wedge guard of the pick-and-press ridge and compared with the general wedge guard. The results show that the jet flow can improve the weir energy dissipation effect, especially in the small flood conditions, the improvement is obvious. The velocity of flow into the energy dissipation platform is reduced, which can reduce the inflow of water to the weir foot. Kanye into the jet in the form of bending down, can increase the role of water on the stability of the next level of protection. General wedge guard only appears near the head of a maximum pressure, pick and squeeze the wedge guard first and tail each have a pressure peak, can improve the stress conditions of the guard, is conducive to the overall stability of the cofferdam.