离心机自由场地震响应的完全耦合模拟

水平场地地震响应分析是岩土地震工程实践中最重要的问题之一。当场地土为饱和砂时，由于需要考虑材料的非线性和土-水之间的相互作用，问题非常复杂。利用有限元程序SUMDES和适用于颗粒材料的统一本构模型，对离心机自由场振动试验进行了完全耦合模拟。分析结果表明，完全耦合分析能够较好地再现试验中观察到的现象，包括孔隙水压力的产生和消散以及土体的变形，但前提是对模型参数进行准确的标定，以及对相关系数尤其是动力渗透系数进行准确的确定。

Fully coupled simulation of seismic ground response at centrifuge

Analysis of response of level ground subjected to earthquake is one of the most important problem in geotechnical engineering practice, which could be very complicated especially when saturated sand is involved, as material nonlinearity and soil-water interaction should be taken into account. A fully coupled simulation of seismic ground response at centrifuge was performed, by use of the finite element procedure SUMDES, incorporating a unified constitutive model for granular material. The analysis results show that the ability of fully coupled code to reproduce the whole picture observed in the test, including generation and dissipation of excess pore pressure and deformation of soil body. The importance of calibration of model parameters and determination of the corresponding coefficients, especially the coefficient of permeability is also demonstrated.