小粒的材料上的二轴的砍测试被不同元素方法(DEM ) 数字地模仿。小粒的材料的微观结构的进化在各向同性的压缩期间并且砍被调查,在哪个上收益功能被导出。新收益函数让那个在修改凸轮泥土使用了的一种类似的形式当模特儿并且在各向同性的压缩下面向收益解释小粒的材料的特征并且砍通过接触的变化的过程在粒子接触角度 θ 定义接触的分发 N (θ ) 。
A biaxial shearing test on granular materials is numerically simulated by distinct element method (DEM). The evolution of the microstructures of granular materials during isotropic compression and shearing is investigated, on which a yield function is derived. The new yield function has a similar form as the one used in the modified Cam-clay model and explains the yield characteristics of granular materials under the isotropic compression and shear process through the change of the contact distribution N(θ) defining the contacts at particle contact angle θ.