变顶高尾水隧洞混凝土先拱后墙法方案论证

Expounding and Verifying of the Method of Concreting Crown First and Then Walls of a Tailrace Tunnel with Variable Crown Height

彭水水电站地下厂房系统建于地质条件复杂的岩溶地区,在国内首先采用了"变顶高尾水隧洞"这一新型的尾水流道体形,首次在大型洞室混凝土施工中采用先拱后墙法施工程序。经过理论和实践论证了该方案的可行性,对其它类似工程施工有借鉴作用。

The underground powerhouse system of Pengshui Hydropower Project is located in a karst region with complex geological conditions, in which a new configuration of tailrace flow passage called a tailrace tunnel with variable crown height has been employed for the first time at home, and the method of concreting crown first and then walls was adopted in its construction for the first time in concreting of large chambers and caverns. Both the configuration and the method have been verified theoretically and practically. They can be used for reference for construction of similar projects.