3D-FEM Analysis And Anti-seismic Safety Evaluation For High Core-wall Rockfill Dam

The construction of high earth-rock dams had developed fast in the recent years.High earth-rock dams had built in the western areas which held rich water resources.But most of western areas located in high earthquake intensity regions.So the anti-seismic safety evaluation for high dams was very important.Specially after wenchuan earthquake the stress and deformation of high earth-rock dams were analyzed in the static condition.And people had paid close attention to the anti-seismic safety evaluation for high earth-rock dams.This paper regarded actual engineering as an example.This 350m super-high core-wall rockfill dam was researched as follows:(1) The 3D-FEM model was built based on structure of dam and terrain.The Duncan E-B model was used for 3D-FEM static analysis.(2) The mathematic model of wetting was introduced in the 3D-FEM static calculation. The change of displacement and stress was analyzed after considering wetting.The effect of wetting with respect to dam was discussed.(3) The anti-seismic safety evaluation for dam was completed on the foundation of static and dynamic finite element analysis.Analysis of earthquake induced permanent deformation for dam had done by equivalent nodal force method.The safety factor of core-wall material, filter material and sand of dam foundation under seismic loads had been estimated by Seed. According to the dangerous situation of dam under seismic loads the author had provided corresponding anti-seismic and reinforcement measures.At the same time gave some beneficial conclusions.This paper had provided experiences and references for future construction of high earth dams.