变换应力三维化方法在清华模型中的应用

QINGHUA MODEL REVISED BY SMP CRITERION

空间滑动面破坏准则是描述三维应力状态下土体剪切屈服和破坏特性的最好的破坏准则之一;清华模型作为三维弹塑性模型在国内有一定的影响。采用变换应力方法将空间滑动面破坏准则和清华模型结合起来,使其得到合理三维化,简单且易于理解,不增加任何新的参数并能合理地描述土体在一般应力条件下的力学特性。

Spatially mobilized plane（SMP） criterion is one of the most famous failure criteria in the field of soil mechanics when describing characteristics of soil under the three-dimensional stress condition, while Qinghua model is one of the most famous domestic constitutive models. It＇s aimed to combine SMP and Qinghua model using a transformed stress tensor based on the SMP criterion. Thus the Qinghua constitutive model whose failure and yield criterion is SMP instead of Mises yield criterion. Using this method, it can be computed without even increasing original model ＇ s parameters. And this method realizes the consistency from the shear yield to the shear failure with the SMP criterion. The revised Qinghua model is able to describe the behavior of soils in general stress condition including triaxial compression.