宽尾墩,台阶式坝面消能工,是通过宽尾墩后水流的突扩和台阶坝面的连续跌坎,为掠过台阶坝面的水舌下缘提供侧部(坝面无水区)通气条件。原型观测证明沿台阶处形成高掺气浓度的水气混合流,加之台阶对水流流速的消减作用,使台阶免遭空蚀破坏。本研究结合大朝山水电站的建设,从设计优化构想、开展了系统的试验研究,并把设计研究成果应用于大坝的设计和施工,取得了原型观测成果,提供了百米级以上高坝、大单宽流量RCC坝的新的成功实例。

The combined flaring piers and stepped dam face dissipator is designed to provide lateral aeration in the non-water dam area for the lower edge of nappe sweeping over the stepped dam face by both sudden spreading of water flow downstream from the flaring piers and continuous drops made on the stepped dam face. The prototype observation has proved that the formation of mixed water and air flow at the steps with highly concentrated aeration, and reducing of water flow velocity due to the steps prevent the steps from being damaged. The prototype observation results have been obtained on the basis of the systematic test and research as well as of application of the design study results in the design and construction of the dam, taking into account the design optimization and construction of the Dachaoshan hydropower project in the study, and thus a new successful living example of constructing a RCC dam with a height of over 100m and a large per unit width discharge has been provided. 