基于广义塑性力学的黄土湿陷变形本构关系

An constitutive relation for collapsible deformation of loess based on generalized plasticity

分析了黄土湿陷变形的塑性特性,基于广义塑性力学原理建立了湿陷变形的增量本构关系。将增湿含水量作为内应力,应用常规三轴浸水试验拟合得出了湿陷体积屈服面和剪切屈服面,并且给出了黄土湿陷变形的起始屈服面。该模型能够反映湿陷性黄土在不同湿陷作用,即水和力的不同组合作用下的湿陷变形特性,考虑了湿陷体积变形和湿陷剪切变形以及球应力和偏应力对它们的交叉影响。

An incremental constitutive realtion is established based on the generalized plasticity through analyzing the plastic properties of collapsible deformation of loess. The moisture content of increasing dampness is regarded as an internal stress, and the collapsible volume yield surface and the shear yield surface are obtained through tests fitting; at the same time, the initial yield surfaces of collapsible deformation are given. It is shown that the model can reflect the properties of collapsible deformation under the different collapsible effects; and considering the collapsible volume deformation shear deformation and the influence of spherical stress and deviatoric stress to them.