高面板坝三维真非线性地震反应分析方法及模型试验验证

基于所建立的土石料三维黏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,结合考虑孔隙水压力的消散和扩散的有效应力分析方法,开发了高面板堆石坝地震反应分析的三维真非线性有效应力分析方法。通过典型坝例分析,比较了真非线性分析与等效线性分析结果的差异,表明真非线性方法较真实地反应了结构的地震反应,而且能够直接计算出坝体的残余变形,在理论上更为合理。采用模型坝土石料低应力状态下实测的静力和动力特性参数,对三维模型坝进行了地震反应分析,并与相应的大型振动台模型试验结果进行了对比分析,两者结果相当一致,验证了研究所提出的计算方法的可靠性。

3-D authentic nonlinear method for dynamic analysis of high CFRD

Based on the proposed 3-D nonlinear dynamic constitutive model of soil, a 3-D authentic nonlinear effective analysis method for seismic response calculation of CFRD is developed. In the method, the characteristic of interface between concrete face and rockfill is simulated by 3-D anisotropic thin elements and the effective stress analysis method considering the diffusion of pore water pressure is adopted. The difference between the equivalent linear analysis method and the proposed method is demonstrated by an example. It shows that the proposed method can actually describe the earthquake response of the structure and is able to calculate the permanent deformation of the dam directly. The validity of the method is verified by dynamic model test on shaking table.