混凝土在地下高水头洞室群封堵中的应用

Application of concrete in plugging of underground cavern group with high head

原丰满泄洪放空洞岩塞爆破1:2模型试验洞群位于水下30m深处,洞群布置复杂,且多洞室均相互连通,如采用常规水下混凝土封堵方案,施工实施难度极大,封堵混凝土工程量巨大,工期长。通过不同坍扩度及流动性水下自密实不分散混凝土的设计,结合临时封堵体和永久封堵体的局部封堵设计结构,完成模型试验洞的封堵处理,截断水流通道。

The rock-plug blasting 1:2 model test cavern group of flood releasing tunnel of the former Fengman reservoir is located in 30 m depth of underwater, the layout of the cavern group is complex, most of them are connect with each other. If the conventional underwater concrete plugging scheme is used in the construction,the construction difficulty is great, the amount of concrete of plugging is big and construction period is long.Through the design of underwater self-compacting and non-distributed concrete under different slum extension and fluxility, combing with the partial plugging design structure of the permanent and temporary plugging body,the plugging treatment of model test cavern is completed to cut off flow channel.