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本文建立了一个反映饱和砂土在动荷作用下反应特性的弹塑性模型．该模型通过引入相对应力比的概念使得应力路径上的每一个点都处于加载状态．模型不显式定义屈服面和塑性势函数，而是由破坏面、流动方向、初始加载面、加载方向和塑性模量等部分组成，具有参数少且易确定等特点．通过和试验数据的比较证明了该模型的合理性．
This paper establishes an elasto-plastic model reflecting the response characteristics of saturated sand under dynamic loading. By introducing the concept of relative stress ratio, the model puts every point on the stress path in the loaded state. The model does not explicitly define the yield surface and the plastic potential function, but consists of the failure surface, the flow direction, the initial loading surface, the loading direction and the plastic modulus. It has the characteristics of small parameters and easy determination. The comparison between the experimental data and the experimental data proves the rationality of the model.