不同横缝初始间隙的拱形重力坝-地基体系地震响应分析研究

Seismic Response Analysis of a Curved-Gravity Dam Foundation System with Different Initial Gaps of Transverse Joints

本文构建了某拱形重力坝三维全坝段-地基体系有限元分析模型,综合考虑了坝体横缝和坝基交界面接触非线性,采用基于拉格朗日乘子法的动接触力模型模拟接触非线性问题,采用黏弹性人工边界考虑无限地基辐射阻尼效应,分别开展横缝初始间隙0、2和20 mm下的重力坝-地基体系非线性有限元动力时程分析,揭示不同横缝初始间隙对大坝动力响应的影响,为工程抗震设计提供科学依据.

In this paper,a three-dimensional model of a curved-gravity dam foundation system is constructed,which comprehensively considers the contact nonlinearity of transverse joints and dam foundation interface.The dynamic contact force model based on the Lagrange multiplier method is used to simulate the contact nonlinearity,and the viscoelastic artificial boundary is used to consider the radiation damping effect of the infinite foundation.The nonlinear dynamic time history analyses of the gravity dam foundation system with initial gaps of transverse joints of 0 mm,2 mm and 20 mm are performed to reveal the influence of different initial gaps of transverse joints on the dynamic response of the dam,which provides a scientific basis for engineering seismic design.