堆石料动力特性参数对面板堆石坝三维非线性地震响应的影响

本文通过变化堆石微小应变下的剪切模量以及剪切模量衰减曲线和阻尼比递增曲线的取值范围，利用三维等价线性有限元动力分析方法研究了材料动力特性对于高混凝土面板堆石坝的地震反应的影响，多种方案的计算结果对比分析表明，坝料的动力特性对于面板堆石坝等效线性振动体系特性，堆石体地震响应与面板动应力等具有显著的影响。

Effects of Dynamic Properties of Rock-fills on Nonlinear Seismic Response of Concrete Face Rock-fill Dams

In this paper, the equivalent linearization approach together with three dimensional finite element method is used in dynamic nonlinear analysis of seismic response of Hongjiadu concrete faced rockfill dam (CFRD). Based on a number of numerical computations, the effects of the variations of dynamic parameters of rockfill materials on seismic response behavior of CFRD are studied. The initial shear modulus at small strain, the nonlinear variations of shear modulus, and damping ratio with shear strain are taken into account. Besides, the dependence of the variation curves of shear modulus with shear strain on confining pressure is considered. The general characteristics of seismic response of CFRD, including the distribution of peak accelerations of rock fills and dynamic stresses of concrete slab, under different combinations of the related factors, are discussed. Some findings and conclusions, which are helpful to understand the earthquake resistant behavior of CFRD, are drawn through comparative studies.