深厚覆盖层上高混凝土闸坝静力特性研究

Study on Static Characteristics of High Concrete Gate Dam on Deep Overburden

丹巴水电站坝型为混凝土闸坝,最大坝高42.0 m,闸坝基础河床覆盖层深厚,最大厚度达133 m,为世界上拟建于深厚覆盖层上的最高闸坝工程。通过对闸坝进行静力特性研究,研究了闸基沉降、不均匀变形、闸基稳定等关键技术难题,分析结果表明:采用合适的基础处理方案,闸坝基础沉降与不均匀变形得到有效控制、坝体与基础的应力变形协调性较好、闸底板及防渗墙应力状态较好,可满足工程安全运行的要求。

The dam type of Danba Hydropower Station is concrete gate dam,and the maximum dam height is 42.0 m.The dam is founded on a deep overburden with a maximum thickness of 133 m.It is the highest gate dam project in the world to be built on a deep overburden.The engineering construction faces some key technical problems such as the settlement,uneven deformation and stability of gate dam foundation.The analysis of static characteristics of dam shows that,by appropriate foundation treatment scheme,the settlement and uneven deformation of dam foundation can be effectively controlled,the stress and deformation coordination between dam body and dam foundation is good,and the stress state of sluice floor and anti-seepage wall is good,which can meet the requirements of safe operation of project.