The Influence of Drying-Wetting Cycles on the Suction Stress of Compacted Loess and the Associated Microscopic Mechanism

To better understand and analyze the unsaturated stability of loess filling body, it is necessary to study changes in suction stress before after drying-wetting cycles. In this study, SWCC compacted cycles was tested using filter paper method. Then, calculated microstructure sample determined by SEM NMR. The results showed that had an important influence on SSCC loess. change can be well explained microstructure. did not significantly basic trend loess’s SSCC, but increased porosity dominant pore diameter loess, reduced under same matric suction. main significant with occurred within range soil pores. larger diameter, smaller addition, proposes a new method for calculating based PSD parameters.