Study of pore orientation in compacted crushed mudstone by SEM image

Preferred orientation of pores result in the macroscopic anisotropy of soil. In this study, the SEM images of compacted crushed mudstone with different dry densities were analyzed and the orientation of pores were investigated. The results show that with the increase of dry density, the orientation distribution of pores appear anisotropy: the pore orientation distribution gradually concentrates on the direction which is perpendicular to and parallel to compacting direction.