Zhenzhong Shen
Hohai University

The Jiudianxia concrete face rockfill dam with the height of 133.5m is the highest one in Gansu province China, which is located at a very complicated valley. It has overburden layer with the depth of about 39m and a big landform on the right bank. A computation model is set up for analyzing its dynamic behavior under the action of design earthquake and permanent deformation of dam body caused by earthquake by using three dimensional non-linear dynamic finite element method. Then the earthquake response behavior of the dam is analyzed in detail, such as acceleration response, velocity response, displacement response and stress response etc. The general rule of dynamic characteristics of dam is obtained too. The result shows that the earthquake induced permanent deformation settlement of the dam is about 331mm under the design earthquake with peak acceleration of 0.257g, which is 0.19% of the maximum height of dam (including the thickness of overburden layer).The calculation analysis demonstrated that the design of the dam is rational and safety, and the design scheme is feasible. The result can be used as the theoretical bases for design, construction, running and maintaining of the dam.
Key words: concrete face rockfill dam; FEM; earthquake response; dynamic time-history analysis method; earthquake-induced permanent deformation