| In this paper, according to the phenomena of post-earthquake deformation of the earth-rock dam, the effective stress dynamic consolidation method is applied, and the qualitative explain is presented, which provides a reference support for the rational designs of the section and clay core of the earth-rock dams. The main contents in the paper are as follows:Firstly, based on the D'alembert's principle and the effective stress principle, the effective stress dynamic consolidation equation is derived. The equation is then discreted both in space domain by using the Galerkin weighed residual method and in time domain by using the Newmark step-by-step integral method, which results in the establishment of the finite element basic equation.Secondly, the 2-D triangle element, 3-D tetrahedral constant-strain element, 3-D hexahedral constant-parameter element dynamic consolidation finite element programs were compiled, and then verified by small examples respectively. In these programs, the semi-bandwidth storage mode, the quasi-equivalent elastic-plastic dynamic constitutive model and a small node-optimizing program are used.Finally, the compiled 3-D tetrahedral constant-strain element dynamic consolidation finite element programs is used for the dynamic consolidation analysis for the earth-rock dam with clay core of Qiabuqihai hydropower project on the Yilitesi river in Xijiang. Theresults indicates that, the post-earthquake pore water pressure in the dam is redistributed, and the location of the zones where the pore water pressure increase changes with the increased time. The increasement of the pore water pressure results in the reduction of the soil effective stress and shear strength. If the pore water pressure on the potential sliding surface of the dam body increase, the sliding resistance of the dam body will be reduced. Once the sum sliding force is bigger than the sliding resistance, the earth-rock dam will be deformed.
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