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Abstract High arch dam of Jiangping River Dam is constructed in a complex geological site which is unfavorable to the stability of dam abutment. Then nonlinear constructive relationship and failure criterion combined with 3D dynamical finite element analysis is applied to the arch dam and abutment considering static loads and seismic loads. The dam¢s mode shape and natural frequency of different water levels according to mode analysis for vibration-free arch dam based on block Lanczos method are studied；and then，dynamical response considering seismic function according to mode decomposition response spectrum based on norm is studied as well as stress and displacement developing and possible instable modes of the arch dam. Simultaneously，the results including stress，displacement and safety coefficient of the dam considering seismic action are compared with the corresponding results without considering seismic action. The results show that seismic load will worsen deformation and stress state of high arch dam under complex conditions and quicken its instability
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Received: 18 April 2007
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