龙首二级面板堆石坝三维真非线性地震反应分析和评价

3-D authentic nonlinear dynamic analysis and evaluation of Longshou concrete faced rockfill dam

基于土石料三维粘弹塑性动力本构模型,并采用新型三维各向异性有厚度薄单元来模拟面板和堆石的接触面特性,建立了高面板堆石坝地震反应分析的三维真非线性动力分析方法。利用坝料动力特性的大型三轴试验成果,分析计算了龙首二级(西流水)面板堆石坝的地震反应,主要包括加速度反应、堆石体应力反应及坝体单元抗震安全系数、面板应力反应和变形及接缝位移、高趾墙动力反应等。为大坝的抗震设计提供了有力的技术依据。

Based on the proposed 3-D elasto-viscoplastic dynamic constitutive model of soil and applying a new kind of 3-D anisotropic thin element to simulate the interface, a 3-D authentic nonlinear seismic response analysis method for high concrete faced rockfill dams (CFRD) is presented. Using the proposed method, based on large-scale triaxial dynamic test results of soils, the acceleration and stress response, joint dynamic displacements and element anti-seismic safety of Longshou CFRD are studied and evaluated. The results show that the concrete faced rockfill dams (CFRD) have good anti-seismic ability.