等主应力比路径砂土的弹塑性本构方程

Sand's Elasto-plastic Constructive Model Under Constant Ratio of Principal Stress Path

为了模拟填土工程中土体的变形,需要建立在等主应力比应力路径下的本构模型.采用数值建模方法建立等主应力比路径下砂土的弹塑性本构方程.该模型能够反映填土施工中应力路径的影响.通过可视化,绘出了整个应力场中的三维变形曲面.通过与CTC路径下的变形曲面比较,发现两者之间存在显著差别,验证了应力路径对本构关系的影响是不可忽略的.

To simulate the deformation of soils in fill construction,it is necessary to build up the constructive model under the stress path of constant ratio of principal stress.For this reason,the elasto-plastic constructive model of sand under the stress path was constructed by using the numerical modeling method.This constructive model can reflect the influence of stress path in fill construction.Through visualization,the three-dimensional deformation surface in whole stress field was drawn.In addition,in comparison with the deformation surface of CTC path,it was found that the differences between two kinds of surfaces were obvious.Therefore,the effect of stress path on the constructive relation of soil cannot be neglected.