东风水电站导流底孔及导流洞封堵设计

Closure design of diversion bottom hole and tunnel in Dongfeng Hydropower Station

通过合理选择封堵程序，优化封堵结构，针对导流洞和底孔的不同约束条件，分别采用内掺（Ｆ）型复合膨胀剂和外掺ＭｇＯ两项新技术，对封堵混凝土的膨胀量进行有效控制，为顺利完成封堵任务创造了条件，保证了封堵质量和拱坝结构受力的条件。

On the basis of selecting reasonable closure procecures, potimizing the structure of closure and the different restrictions of diversion tunnels and bottom holes, two new tedchniques of internal mixed expansionagent and external mixed MgO were adopted to control efficiently the swelling capacity of the closure concrete. As a result, the closrue work is smoothly and the quality of closure and the proper stress distribution of arch dam are ensured