针对以往本构模型或过于简单而不能全面描述土体的性质,或过于复杂而不便于应用的问题,以非线性弹性、弹塑性、艳正曼辛准则及Singh-Mitchell蠕变模型为基础,并将曼辛准则扩展至三维,建立了一种简单实用而又能同时合理地考虑土体非线性、动力滞回和流变特性的统一弹塑-黏塑性本构模型.通过试验模拟,验证了该模型的合理有效性. For the past constitutive model or too simple and can not fully describe the nature of the soil, or too complex and not easy to apply the problem, the nonlinear elasticity, elasto-plasticity, is the Mann-Singing criterion and Singh-Mitchell creep model, And the Mansing criterion is extended to three dimensions, a simple and practical unified elastic-plastic visco-plastic constitutive model which can simultaneously consider soil nonlinear, dynamic hysteresis and rheological properties is established.According to the experimental simulation, The model is reasonable and effective.