Non-linear Dynamic Characteristic Of The Earth-Rock Dam Constructed On Deep Overburden

In the dynamic analysis of the rockfill dam, the seismic excitation cannot be treated easily. Appropriate seismic excitation input is adopted to handle the difficulties, and the discrete seismic data are introduced to the dynamic finite model correctly.Secondly, static finite element method is utilized for the Xia Ban Di rockfill dam project based on Duncan-Chang hyperbola model, and the static stress and displacemnet field changing regularities of the dam are got. Dynamical finite element method is utilized based on equipollence linearity model, and the dynamic stress and displacement field changing regularities of the dam are got. In the analysis, some technical problems that may be encountered in analyzing problems with deep overburden are well solved: the initial ground stress is loaded correctly, and the contact characteristics are set, and the boundary condition is treated, so the true behavior of the dam is well simulated most possibly.Thirdly, because of the depth of deep overburden which has the height of 147m is two times of the dam body, and the stress state of the seepage prevention wall is very complicated, and the concrete seepage prevention wall and curtain grouting are adopted, and the dynamical stress field and displacement field changing regulation are given.Finally, the rule of the change of stress and displacement with the change of characteristic parameters for seepage prevention wall under time of engineering completion and water impounding operation period is given in this paper. The optimal concrete material of the cut-off wall is during the 2000 and 3000MPa called low elastic module conctere, which can not only adapt deep overburden deformation but also has many traits, it has high strength, good resistance to penetration, and better resistance to erosion.