土动力学试验与计算研究

Study on Experiment and Calculation of Soil Dynamics

以自行研制的大型电液伺服粗粒土动静三轴试验仪为工具，对砂砾石、掺砾土两种粗粒土的试验资料作了较深入的研究，提出了供动力分析使用的振动孔隙水压力和残余应变数学模型。考虑初始剪应力影响，归纳了指数函数型表达的超静孔压增长规律和残余剪切变形规律。在三维有效应力有限元法中，运用上述模型对地基土的地震反应进行分析，不但可模拟土体孔压和永久变形在地震过程中的变化情况，而且能够对地震过后一段时间的变化进行模拟。

Taking large-sized static and dynamic tri-axial servo device for coarse grain soil as a tool developed by self, the mathematical model of vibration pore water pressure and residual strain for the analysis and use of power has been studied deeply. It has developed in view of testing data of both coarse grain soil with sandy gravel and gravelly soil. The law of excess pore pressure increment and residual shear deformation expressed by exponential function has been induced considering the effect on initial shear stress. The model mentioned above is used in the finite element method of three-dimensional effective stress to analyze the earthquake reaction of foundation soil. It not only can simulate the changeable circumstances of soil pore pressure and permanent deformation in the process of earthquake, but also the variation in a period after earthquake.