基于SMP破坏准则的饱和砂土弹塑性本构模型

利用土体的塑性流动理论，提出了用于描述饱和砂土在单调荷载作用下的应力一应变反应性质的弹塑性本构模型。土体总的变形由三部分组成：即弹性应变、与体积屈服机制相关的塑性应变和与剪切屈服机制相关的塑性应变，其中与剪切屈服机制相关的塑性应变的得出是基于SMP破坏准则。通过将模型预测的结果与试验结果进行对比，表明该模型能够较为准确地描述饱和砂土在单调加载条件下的反应性质。

Elasto-plastic Constitutive Model of Saturated Sands Based on the SMP Failure Criterion

Based on the plastic flow theory of soils, an elasto-plastic constitutive model for describing the stress-strain behavior of the saturated sands under the action of monotonic loading is developed. The total deformation of soils consists of three parts: elastic strain, the plastic strain related to the volumetric yielding mechanism and the plastic strain related to the shear yielding mechanism, which can be deduced by the SMP failure criterion. By comparing the results predicted by the model with the test results, it is shown that the presented constitutive model can describe the response behavior of saturated sands subjected to monotonic loading with reasonable accuracy.