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传统的本构理论隐含了应力和塑性应变率的共轴条件,无法客观描述主应力轴旋转试验中的非共轴现象。因此,在已有的本构模型中引入非共轴塑性流动理论来描述这种非共轴现象,并对形状函数进行了修正。通过对真三轴试验、单剪试验和空心圆柱试验进行数值模拟,表明修正后的形状函数能够更好地描述砂土在真三维状态下的变形特性,更重要的是非共轴理论的引入使得模型能够合理预测主应力轴旋转过程中主应力和主应变率的方向变化规律。
The traditional constitutive theory implies the coaxial conditions of stress and plastic strain rate and can not objectively describe the non-coaxial phenomenon in the rotation test of the principal stress axis. Therefore, the non-coaxial plastic flow theory is introduced into the existing constitutive model to describe this non-coaxial phenomenon, and the shape function is modified. The numerical simulation of the true triaxial test, the single shear test and the hollow cylinder test show that the modified shape function can better describe the deformation characteristics of sand under true three-dimensional state. More importantly, the introduction of non-coaxial theory makes The model can reasonably predict the direction of principal stress and principal strain rate during the rotation of principal stress axis.