Abstract
In the study of fracture mechanics of soil, the influence of the particle rotations are usualy ignored. But their influence cannot be ignored on shear strength. To study the mechanism of granular materials, the Distinct Element Method (DEM) are used commonly. In DEM, the particle rotations are considered, but some details, as the peek strength, are not well-simulated. In this paper, we decompose the sliding and rotational relative displacement from the tangential dispacement at the particle contact. Then we install the effect of moment (couple stress) transfer at the particle contacts into DEM. Biaxal tests are done and the results shows the effect is sufficient and the validity of the new DEM.
