Vacuum freeze drying method is applied to prepare samples for SEM from one-dimensional consolidation clay which suffered different pressures from original remolded state. And then simple and synthetical micro-structure parameters of SEM photos obtained from some section are studied to uncover relation between mechanics properties and micro-structure. The results tell us that the first principal component approximately linear increases with consolidation pressure. It is distinct that the synthetical parameters are superior to the simple parameters in construction soil mechanics relation because the former can reflect the whole micro-structure qualities, but the latter can not.
Based on the principle of pedigree cluster, recursion formulae of distance between micro-structure parameters are given. Then, pedigree cluster method and corresponding process for loess micro-structure parameters are proposed to classify micro-structural characters of loess before and after collapsing. The study results indicate that micro-structures of loess before and after collapsing have significant cluster characters. The grain on horizontal section is considered as isotropic. Geometrical anisotropy of the grain on other sections is distinct. The proposed method can evaluate the difference of grains in study field in size, shape, deposition, direct, area distribution and grey distribution.
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