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为解决高水头深厚覆盖层河流上土石过水围堰的安全度汛问题,以双江口水电站过水围堰为例,通过1∶60的水工整体模型试验,对不同围堰体型及围堰防护方案进行了试验研究。试验结果表明,对于高水头深厚覆盖层土石过水围堰,当下游水深过低时,在堰面上设置消能防冲平台并不能达到水流消能的目的,可通过对围堰堰脚下游的河床进行防护,使冲坑远离堰脚,以保持过水围堰的整体稳定性。研究成果可为类似工程提供参考。
In order to solve the problem of flood control for the safety of earth-rock crossing cofferdam on the river with high head and deep overburden, taking the cofferdam of Shuangjiangkou Hydropower Station as an example, through 1:60 hydraulic overall model test, different cofferdam body types and cofferdam Protection programs were tested. The test results show that for the over-water cofferdam with high head and deep overburden, when the downstream water depth is too low, the energy-dissipating and anti-scouring platform on the weir can not achieve the purpose of energy dissipation. Of the river bed to protect the pit away from the weir feet, in order to maintain the overall stability of the cofferdam. The research results can provide reference for similar projects.