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本文根据有效应力原理提出了一个计算饱和土体地震反应的二维动力分析方法.该法不仅考虑到动剪应变与动剪切模量之间的非线性关系,而且还考虑到振动孔隙水压力逐渐增长的效应(砂土软化)而变化的动力性质.这个方法能够求得地震过程中饱和土体的加速度、动应力、动应变以及振动孔隙水压力随着时间的发展、液化的开始、发展过程.以江西德兴铜矿4号尾矿坝为例,采用等参数有限单元法,用本文提出的分析方法和建议的振动孔隙水压力增长模式以及两种地震曲线,详细地分析了该坝在0.4g地震情况下的液化过程,并与目前流行较广的总应力法算得的结果作了比较.
In this paper, a two-dimensional dynamic analysis method for calculating the seismic response of saturated soil is proposed based on the principle of effective stress. This method not only considers the nonlinear relationship between dynamic shear strain and dynamic shear modulus, but also considers the vibration pore water pressure. The gradually changing effect (sand softening) of the dynamic nature of the change. This method can obtain the acceleration, dynamic stress, dynamic strain and vibration pore water pressure of the saturated soil during the earthquake process, the development of liquefaction over time, and the development and development of liquefaction. Process. Taking the No. 4 tailings dam of Dexing Copper Mine in Jiangxi Province as an example, the isoparametric finite element method was used to analyze the dam in detail using the analysis method proposed in this paper and the proposed vibration pore water pressure growth model and two seismic curves. The liquefaction process in the case of 0.4 g earthquake is compared with the results calculated by the more popular total stress method.