均质土坝三维动力响应分析

基于有限元软件ABAQUS,运用等效线性模型子程序,对某小型均质土坝进行三维动力响应分析。计算结果表明,地震作用下坝顶、上游坝坡近坝顶等位置有可能会有坝料松动、滑落的可能,防渗墙可能发生受拉破坏;竖直向地震永久变形最大值发生在坝顶靠近库外坝坡的一侧,且随着高程的增大,地震永久变形增大。通过分析土坝地震永久变形、动位移以及防渗墙的响应,验证了这种方法对于均质土坝的适用性,相关结论可为类似工程的地震设计提供参考。

Based on ABAQUS and the subroutine of equivalent linear model, the three-dimensional dynamic response of a small homogeneous earth dam is taken. The results show that under the earthquake, there may be loosening and sliding of dam materials at the top and upstream dam slopes near the top of the dam, and tension failure of the cut-off wall may occur;the maximum vertical seismic permanent deformation occurs on the side of the dam top near the dam slope outside the reservoir and the seismic permanent deformation increases with the increase of the elevation. The applicability of this method to homogeneous earth dams is verified by analyzing the earthquake permanent deformation, dynamic displacement and the response of cut-off wall of earth dams, therefore, this conclusions can provide reference for seismic design of similar projects.