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A parabolic model and an iterative algorithm for the slab-cushion interface and the application in simulating the dynamic separation between the face slabs and cushion layer
European Journal of Environmental and Civil Engineering ( IF 2.1 ) Pub Date : 2020-12-10
Sheng Zhu, Zhiyuan Ning

Abstract

The new damage phenomenon of the Zipingpu concrete-faced rock-fill dam (CFRD) in the 5.12 Wenchuan earthquake has introduced new topics to the study of seismic failure mechanisms and numerical simulation methods of high CFRDs. With respect to the large-scale contact separation between the face slabs and the cushion layer after the earthquake, the conventional method of directly assigning constant values ​​to the normal stiffness of the interface element can only qualitatively reflect the separated or closed state of the interface. In this article, a parabolic model for the normal stiffness of the interface is proposed, and an iterative algorithm for its optimal value is established based on the contact states. Combined with a generalised plasticity constitutive model, the 3 D finite element (FE) coupling analysis of the Zipingpu Dam is performed. The results show good agreements between the numerical calculations and field measurement conclusions. In addition, the opening and closing processes of the interface during the earthquake reproduce the dynamic face-slabs separation situation. It is indicated that the proposed constitutive model and the iterative algorithm can basically realise the quantitative estimation for the range and depth of the separation, providing a reliable method for the seismic analysis of high CFRDs.



中文翻译:

板-垫界面的抛物线模型和迭代算法及其在模拟面板与垫层之间动态分离中的应用

摘要

紫坪铺混凝土面板堆石坝(CFRD)在5.12汶川地震中的新破坏现象为研究高CFRD的破坏机理和数值模拟方法引入了新的课题。关于地震后面板与垫层之间的大规模接触分离,直接将常数值赋给界面单元法向刚度的常规方法只能定性地反映出界面的分离或闭合状态接口。本文提出了一种界面法向刚度的抛物线模型,并根据接触状态建立了其最优值的迭代算法。结合广义塑性本构模型,对紫坪铺大坝进行了三维有限元(FE)耦合分析。结果表明,数值计算与现场测量结论之间具有良好的一致性。另外,地震期间界面的打开和关闭过程也再现了动态面板的分离情况。结果表明,所提出的本构模型和迭代算法可以基本实现对分离范围和深度的定量估算,为高CFRD地震分析提供了可靠的方法。

更新日期:2020-12-10
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